So, if you don’t use the official power supply for your Raspberry Pi model, it could be your issue. I plan to route the analog voltages first to an ADS1115 analog to digital converter and then to the Pi via I2C. 2V. Also, avoid plugging it with a USB cable to your computer or with an old USB charger. Mar 18, 2015 · I am new to Raspberry Pi and just got my self a new one. Apr 11, 2018 · One of the most critical but often under-appreciated elements of any electronic product, particularly one such as Raspberry Pi with lots of complex on-board silicon (processor, networking, high-speed memory), is the power supply. See full list on randomnerdtutorials. 3V or less than 0V, as prompt damage to the chip may occur as the input pin substrate diodes (shown as parasitic FETs in Figure 1) conduct. I plan to step the voltages down from 12V and 5V to 3V to prevent frying the Pi using a simple voltage divider. The circuit for connecting the MCP3008 to the Pi looks quite involved, but it’s all about just connecting the wires up correctly. com Nov 3, 2017 · I have a device that puts out 0-5v based on what it's doing. We also power the device via 3. Sep 26, 2016 · You would have to make some electronics and make modifications to the board of that power supply. The second is for the first two generations of Raspberry Pi which had a smaller 26-pin header. Although two other pins also support analog reading, they are not marked on the Pico board. How to read analog voltage with the Raspberry Pi PICO. adc = machine. This is used to drive the power LED on some Pi models. 3 (off the top of my head). Feb 16, 2023 · To calculate the hours this power bank will last, we divide this capacity (74Wh) by the power demand of the Raspberry Pi (3. Two of these are connected to an internal temperature sensor integrated into the RP2040 and the second one can be used to measure the VSYS voltage monitoring on the board. 23422320A 0V8_SW_A current(6)=0. This can appen if the voltage fl Oct 31, 2023 · Learn how to use ADS1115 16-bit ADC With Raspberry Pi. Stability is also an important factor. A transformer gives an alternanting current so it must be rectified and filtered before you enter it in an analog to digital converter. The red power LED is connected to GPIO 35. Hot Network Questions Feb 15, 2016 · Pi5 8GB Mini-PC/Media Centre @3GHz in custom 3D-printed case running Raspberry Pi OS with KODI, 1TB Lexar NM790 SSD on Pimoroni NVMe Base at Gen 3 (870MB/s read), 60mm Gelid Solutions Silent 6 12V fan @5V and GeeekPi C-0048 aluminium heatsink case top. The first printer runs klipper via a raspberry pi 4b which uses the official raspberry pi power supply. You then want the USB end of the USB-Serial adapter to be plugged into your Raspberry Pi’s USB Ports. 0) V. Using a potential devider is is all well and good. Aug 30, 2015 · which battery? the question cannot be answered in a precise way, as you don't provide information to base an answer on. This file is baked into the Power supplies and Raspberry Pi OS. Back-powering. These are: Using the Pi itself to control and power such external electronics. B. I bought a step-down chip to get from 24v-> 3. Jul 22, 2016 · I recently had a project with some LiFePO4 batteries and the discharge curve was pretty easy to see, even with a plain voltmeter. zip" on SD-card. The reasonable voltage range to power the Pi therefore is: 4. physical pin 39. Nothing is connected to USB ports. Here we are using an example code in MicroPython to read the values of the potentiometer which varies the analog input voltage by converting them into digital values. 3V). Not all of them can be read out or connected as there are also some voltage and ground connections. The MCP3008 is the chip that I will be using in this Raspberry Pi ADC tutorial. GPIO pins on the Raspberry Pi 4. May 31, 2022 · You might want to look at using an instrumentation amplifier with the electrodes to amplify the signal, some filtering, and an ADC to convert the analog output of the amplifier (voltage) to digital for reading by the pi. I want to monitor the voltage output of an oxygen sensor for an automobile, on a LCD screen. 33181620A VDD_CORE_A current(7)=0. Raspberry Pi needs enough power to boot. You can minimize the voltage drop by using a lower resistance power cable, as mentioned above. There is a lot of technical information on this chip, but I will just touch on the bare basics. 5 A, you could try to power more than one raspberry pi from one adapter. generally the state of a battery can be read by measuring its output voltage, for a lithium-ion battery, a fully charget battery will be something like 3. Analog input is a great feature of the PICO and using it is very simple. The Raspberry Pi Pico has three analog pins to read analog values from sensors. Unlike other minicontrollers or MCUs nowadays, Raspberry Pi does not have a built-in Analog-to-Digital Converter (ADC) Circuit. On the Raspberry Pi Pico and Pico W the ADC can measure VSYS voltage. 3 (or 3v) in order to intercept the signal with the pi. 5, 3. Jul 25, 2019 · I have warning under-voltage, how I can detect it remote (bash script, python)? I tried read value from pin 35, but I always get similar value (1), nevertheless on swap power supply. Raspberry Pi 4 Model B. 00000000A 1V1_SYS_A current(5)=0. It would be interesting to see if the lightning bolts reappear. I am using battery power, through the USB or microUSB port, to power the Pi. Open a terminal and update the software repositories and then install stress. Some Pi models have an onboard chip which detects a low voltage. 00000000A 3V3_ADC_A current(18)=0 Feb 9, 2016 · Before you wire the ADC to the Pi make sure to enable I2C on the Raspberry Pi using raspi-config. Dec 11, 2021 · In this tutorial, we will explore how the Raspberry Pi can be used to read analog signal data accurately and the use of potentiometers in carrying out this great task. We have used: 1 x Raspberry Pi Pico; 1 x Micro USB Cable; 1 x Breadboard; 1 x 10k Ω Resistor; 4 x 10 Jun 15, 2012 · My experimentation with Raspberry Pi: (big version) Voltage is generated by this device and measured by this meter. ADC(4) # Connect to the internal This setting is deprecated on Raspberry Pi 4 and Raspberry Pi 5. 1V or 5. You will also need to change BCM2708_PERI_BASE to 0x20000000 if you're using a Raspberry Pi 1. Nov 8, 2023 · Code: Select all rpdom@raspberrypi:~ $ vcgencmd pmic_read_adc 3V7_WL_SW_A current(0)=0. Troubleshooting. This can appen if the voltage fl Jul 29, 2012 · The best way to read analog sensors on a Pi is to use an external ADC like the MCP3008. I've seen the Canakit PSU dip a little below 5V under load, but not enough to cause a low voltage warning (at least mine didn't). Jan 30, 2023 · The Raspberry Pi Pico is the first Raspberry Pi that has analog inputs from the manufacturer. Luckily for us, the Raspberry Pi’s processor features an inbuilt temperature probe that we can access. 3V Jan 30, 2022 · Raspberry Pi 2 and earlier and also the Raspberry Pi Zero [ttyAMA0] enabled Utilizing Serial Read and Write on your Raspberry Pi. 15810070A DDR_VDD2_A current(3)=0. Dec 20, 2018 · Hey Schnoogle, I'm not sure if the GPIO35 stuff is actually still valid, so far never found a way to make use of it for low voltage detection. (Using raspberry pi model 3) The sensor output voltage ranges between 0v-1v. The Dec 20, 2019 · I am concerned about something plugged into the pi's 5V pin, and would like to see if there is a way to view how the pi is distributing power (if that's even a thing that CAN be viewed) to its various pins, and how much power the pi is consuming as a whole, stuff like that. Oct 8, 2023 · We’re going to write this script on a Raspberry Pi 5, but the same script will work on all models of Raspberry Pi. , providing the the desinged out/put voltage of the devider don't go above the 3. Raspberry Pi 3 (all models) 5V/2. Jul 26, 2012 · Reading voltage/current from a Wind Turbine. If you are using USB to power the Pico then your Voltage is on VBus and you have a small voltage drop because of the diode. The following code sets pin 7 (GPIO 4) as an output pin and pin 8 (GPIO 14) as an input pin using BOARD numbering. Dec 13, 2013 · Re: read/measure remaining battery power from raspberry pi 4 (power indicator) Mon Oct 03, 2022 6:34 pm If the display on the battery pack goes from 10% to 9% rather than 09% could you blank off the unit figure and measure the light level from the 10's figure using an LDR plugged into a digital input set up in such a way that its voltage swing Aug 7, 2022 · If you look at the Pico's schematic in the Raspberry Pi Pico datasheet (page 24) you can see that the ADC_AVDD pin is connected to the 3V3 supply in a way that allows you to supply an external reference voltage to the ADC_VREF edge connector that will override the 3V3 supply. This includes the values for the voltage divider and the input voltage to the ATtiny13. Hi all, Raspberry Pi Engineer & Forum Moderator Posts: 33606 Joined: Sat Jul 30, 2011 7:41 pm. On Raspberry Pi Pico¶. Jul 23, 2016 · The question was not about fool-proof powering methods, then just buy the official Raspberry Pi power adapter. On Raspberry Pi 4 and Raspberry Pi 5 the over_voltage_delta parameter adds the given offset in microvolts to the number calculated by the DVFS algorithm. I read that I cannot read the voltage directly. 3V obtained from the Raspberry Pi. That setting GPIO25 high may be what you are missing. 5 (3. 07 V (Raspberry Pi Power Limitations). I have installed raspian OS on it. As you probably are going to supply the ADC from the Raspberry 3. Then use the DMM red wire to look at one other GPIO pin. 3 volt logic pins. 5 second intervals), including consumption, generation, and net-production. Any one have any tips on this. The following graphic lists the complete pins including functions and numbering. I have 2 Ender 3 printers, both running klipper. 6, voltage to A0 on D1 mini is 14. rs. 3V will be read by the Raspberry Pi as HIGH and if the voltage is lower than 1. 7 V to 5. Depending on how VSYS is powered the readings will have different meanings - either power supply voltage when it is connected to VSYS pin directly, or USB voltage (VBUS) minus some drop on the Schottky diode the Raspberry Pi Pico has between those pins. Get the voltage of USB of a TV and read it to the Raspberry Pi. 2W, when watching a 1080p video). As the Pi's become more powerful they also require more power, so the power supply that worked with the Pi2, could result in under-voltage warnings on the Pi3. 5W Micro USB power supply May 20, 2023 · The digital power monitors connect to the Raspberry Pi via the I2C port. Dec 30, 2023 · I’ll clarify as to why I want to measure the voltage of the pi. I started Raspberry Pi with Ethernet and HDMI connected, with usual Raspbian "2014-06-20-wheezy-raspbian. As the battery level drains the voltage output by it is reduced. 3V; ADS1x15 GND to Raspberry Pi GND; ADS1x15 SCL to Raspberry Pi SCL Power supplies and Raspberry Pi OS. 3 V this gives you some over voltage protection. Apr 13, 2023 · The Raspberry Pi Power Monitor is a combination of custom hardware and software that will allow you to monitor your unique power situation in real time (<0. Oct 31, 2012 · fdufnews wrote:You SHOULD use a transformer to take the voltage down to 3V (or 5V) and make it compatible with your measuring circuit but aboveall for isolation purpose. A voltage near 3. You can specify which ADC channel you’re using by pin number, e. Apr 30, 2022 · Getting the Raspberry Pi Temperature Using the Terminal. This can appen if the voltage fl We know that whatever we read will be halve of the actual external voltage, so to convert this value back to the actual voltage: int sensorValue = analogRead(A0); voltage = sensorValue * (10. Apr 6, 2019 · Seeed ADC (ADS1115) with Raspberry Pi 3 B+to read voltage values using python3. The code will read analog value from Pin A0 fed using the potentiometer. Sep 23, 2020 · Should your only problem is the span (0 - 10 V), use a voltage divider so that 10 V -> 2. A GPIO pin should never be connected to a voltage source greater than 3. The good thing is all these connections are close by on the 40 pin connector, so we only need a small 2×6 pin header. Sep 26, 2012 · So If battery voltage is 14. 8V will be read as LOW. 0 / 1023. While they all look the same and we commonly refer to them as the “GPIO pins” collectively, only 26 of them are actually GPIOs. Raspberry Pi 4. Thu Jul 26, 2012 9:39 am . Pins 26, 27 and``28`` can be used as analog input on the Raspberry Pi Pico. g. While most of the discharge curve was flat in the middle, the first 20% and last 20% (the knees) were very easy to see. The Pi3 and Pi3B+ (and probably Pi Zero W) DO NOT use pin35 to indicate power. 5W Micro USB power supply. This can appen if the voltage fl Sep 29, 2023 · Python Code to Read Analog Value using ADS1115 & Raspberry Pi. 0) Now this can be put into a nice little script to output this value over serial to the Raspberry Pi, and display it somewhere. That's why so many adapters are listed at 5. 1. How can I use the raspberry pi to read those voltages? I would then have scripts do whatever is needed or maybe display via a webpage. ADC max voltage: 3. The Pi has a fuse in the usb connector, but that is not to protect against wrong usb powering, what is the chance on such event, but against short circuit in a usb device or cable that receives power FROM the Pi. over_voltage_delta. Note: Do not connect a device with an input voltage above 3. 6/122*22 = 2. Oct 16, 2012 · These are 3. There are many other configuration variables documented in src/main. He used a simple voltage divider to get the 12V down to something usable by the MCP3008/Pi, and wrote some java scripts (available here on Github) to read the values. I have a Rasbperry Pi 3 B+ powered by a Cana Kit power adapter, the output of which is rated at 5V and 2. Oct 20, 2020 · Raspberry Pi is a tiny computer that is capable of accomplishing many great projects, thus it's still the favourite amongst many tinkers and tech enthusiasts. 07124290A 1V8_SYS_A current(2)=0. 5V/3A. The left (green) side should symbolize the board of the Raspberry Pi. Take a look at the pinout of Raspberry Pi Pico W below to locate the ADC pins. Jun 25, 2019 · (TBC): Furthermore the "Power good" pins of the PMIC used on the Pi 3B+ (and thus likely on the Pi 4 too) was used to trigger the low voltage warning at 4. In this tutorial, we will be using the ADS1115 16-bit ADC with the Raspberry Pi to read an analog value from a sensor. Now to get power consumption you need to get the current because power is voltage * current. Most Python programming tutorials present two approaches to powering external electronic devices with a Raspberry Pi. Here is the Python Code to interface ADS1115 16-bit ADC Module with Raspberry Pi. SPI software. 0V, but must not reach that value, or you will damage the battery. Universal Serial Bus (USB) Maximum power output. You can monitor the GPIO to check for an under voltage condition (less than 4. Connect the ADC to the Pi as follows: ADS1x15 VDD to Raspberry Pi 3. But, as noted, altering GPIO25 while wireless operations are in progress would be potentially catastrophic; the documentation explicitly states that "only when there isn’t an You can program the Raspberry Pi’s GPIO pins with Thonny, which is the default Python editor that comes with the Raspberry Pi OS. To be able to retrieve the temperature of the Raspberry Pi, you will need terminal access. ADC(26) # Connect to GP26, which is channel 0 or by channel, adc = machine. Configuration for the Munin graphs is stored in src/munin. Overheat protection. Recommended power supply (voltage/current) Raspberry Pi power supply; Raspberry Pi 5. 7V, which will sink towards 3. Don't move forward until I2C is enabled and you've checked the ADC is visible with the i2cdetect command. Nov 9, 2022 · Table: Raspberry Pi Pico ADC pinout. All I need to measure is up to 30V DC as I use a Variac to produce the 230V I need to test the product but I use my DMM to measure the VDC on the battery inputs to adjust the voltage according to the temperature at which i'm testing it. Nov 30, 2016 · Hello! I'm new to the raspberry pi. 65V). A potentiometer’s pins are ground, data, and 3V3. My plan is to plug a power source into one of the GPIO pins and read the voltage. Known USB Jan 26, 2014 · Voltage: Put one wire (black) of the digital multimeter to pi Ground (see pinout link below) e. This can appen if the voltage fl The first three GPIOs (26, 27, and 28) can be used to read voltage from peripherals, while GPIO29 can be utilized to measure the voltage level of the VSYS supply on the Raspberry Pi Pico board (VSYS is the input voltage that powers the board). In this segment of the tutorial, you will need to have your USB-Serial adapter plugged into the RS232 adapter. Raspberry Pi 2 (all models) 5V/2. 02147046A DDR_VDDQ_A current(4)=0. Basically I am creating a test set for a power supply that the company I work for make. Raspberry Pi 5. However, even this wonder machine isn't perfect. 3V to any of the general-purpose input/output pins, or else it will fry the Raspberry Pi. Oct 12, 2020 · The original Raspberry Pi included 26 pins, but ever since the Raspberry Pi 2, it has included a 40 pin board. I intend to use that 24v power to let my Pi know whether the door is open or not. Required components: Raspberry Pi Pico; 10k Potentiometer; Few Connecting wires Dec 12, 2020 · I happen to disagree - I selected 3. 3 V is interpreted as a logic one while a voltage near zero volts is a logic zero. Jan 29, 2021 · On Raspberry Pi Pico, the first three of these are brought out to GPIO pins, and the fourth can be used to measure the VSYS voltage on the board. 75012000A 3V3_DAC_A current(17)=0. Please advise. 6V as the last step for my little test because from the publicly available bit of schematics one can clearly read that whatever voltage you throw at Pi, it gets converted (buck-converted) to a few other voltages, namely 1. It comes with a total of 5 ADC inputs (Analog Digital Converter). A potentiometer is a good example of an analogue input device: it’s simply a variable resistor, and the Pi reads the voltage (from 0V to 3. Jan 30, 2014 · Re: Reading power consumption from Shelly Plug-S Wed Oct 19, 2022 5:05 pm Thanks, I have my shelly plug devices on different LAN:s and my main server would be on my home LAN (which has a public IP address). Essentially, a sensor is connected to the Raspberry Pi, measures and logs the data. Jan 12, 2013 · Various ways to read a voltage eg voltage divider circuit and MCP3002 ADC. An Analog-Digital Converter returns a digital value proportional to the measured input voltage. But if you don't want to wire up an extra chip and you're OK with low-resolution sensing, you can read many sensors that act like resistors using the RC timing trick! In this tutorial, we learned how to read analog values using MicroPython with Raspberry Pi Pico board and how to measure DC voltage with ADC of Pico board. Enable battery charging. 63±0. Since model B +, the Raspberry Pi’s have a 40-pin header. Disable battery charging. Rpi Reading MCP3008 10 bit ADC Result Problem. Let’s get started! Jul 24, 2020 · The project takes tens of thousands of samples per second from up to 6 current transformers and one required AC voltage input source, corrects for phase errors, calculates instantaneous power I am currently using my Raspberry Pi as a data logger for a rain gauge. You can see from the diagram below that all of the grounds in the Dec 30, 2023 · Raspberry Pi Pico ADC. Power supplies and Raspberry Pi OS. Here are the specifications of Raspberry Pi Pico W ADC: ADC Resolution: 12-bit. Therefore, a 20,000mAh power bank should power the Raspberry Pi 4 for about 23 hours, when watching videos and under a low intensive load overall. 3v GPIO in/put. Jun 4, 2016 · The only way to deliver the rated voltage is to start with slightly higher voltage to compensate for the inevitable voltage drop. Mar 14, 2024 · A voltage between 1. Please only do that if you know how to do it and what you are doing since Lithium batteries can catch fire if short-circuited or damaged, and it's a nasty chemical-type fire that burns hot, emits toxic fumes and is hard to extinguish. 8V and 3. Is there a way to measure the voltage coming out of my battery ? Read Analog voltage sensor with ADS1115 16-Bit 4-Channel I2C by Raspberry pi and Node redads1115 raspberry pi | Analog signal Node red | Voltage Sensor Raspb . 63volts (I actually calibrated the scaling factor using using my bench power supply) Program the D1 mini using Arduino IDE (with esp8266 board support added) on a PC - or could use a pi ! Raspberry Pi GPIO Overview. We’ll be using the ADS1x15 library to control the ADC. As @joan stated GPIO 35 is connected to the power. Oct 3, 2022 · To read actual VSYS voltage that GPIO25 must presumably be set high, then returned low to allow wireless operation. 3V — one special ‘quiet Inadequate power supplies seem to be a prevailing challenge for both new (and old) Raspberry Pi users. 2, 1. 00000000A 3V3_SYS_A current(1)=0. You also can connect it by following the setup detailed here - basically you set up a circuit as so: The raspberry pi does not support analog inputs like what you are describing without an expansion module. I am going to follow your wiring instructions but i have two further questions on what you said: Aug 28, 2017 · Using a multimeter, I am comparing pin 6 (GND) with pin 8 and getting only 1. 2. Jun 15, 2024 · Raspberry Pi Pico ADC MicroPython code to read the analog values. As the official raspberry power adapter is rated 2 or 2. We can read the batteries voltage by connecting it to an ADC pin on the Raspberry Pi Pico. Nov 22, 2023 · N. Is this possible? Ex. You can further extend it to measure higher voltages such as AC voltage by using an appropriate voltage divider and voltage step-down circuits. Real Time Clock (RTC) Add a backup battery. 91V after bringing pin 8 high. This is all with 40 pin header (except Zero - which doesn't actually have a header or AFAIK a power monitor). Raspberry Pi Zero, 1, 2 and 3. 8, 2. On Pico W you need to disable the wifi /bluetooth to read Vsys To get the power you need to read the actual voltage and current. Mar 24, 2014 · The Canakit PSU is okay (I've had one), but the official Raspberry Pi Universal Power Supply is better. "The Raspberry Pi 4 utilizes the MxL7704’s on-board ADC to determine if there is a Oct 27, 2022 · This project can be used to gather data about how long it takes a AA battery to drain. Sampling frequency: 48Mhz. In fact, the Raspberry Pi 3B+ has no fewer than six different voltage rails: two at 3. Sep 6, 2019 · I would like to read the voltage from a 12V battery and a 5V analog pressure transducer with my Pi 3b+. This guide aims to demonstrate the utilization of the MCP3008 I/P chip, enabling your Raspberry Pi to retrieve digital data from analog sensors. I don't have any experience with these, but it shouldn't be too tough. cfg. Copy the following code and paste it on the Thonny IDE editor window. Insufficient power supply. This printer doesn’t suffer any voltage issues and runs fine. 27W USB-C power supply. 15W USB-C power supply. If so, you should ignore the current rating, and use it to power only one pi. Monitoring. Jan 14, 2016 · This answer is correct for Pi models available at the time. I would like the pi to log the readings every second or every few seconds, just not sure how to start. Models A+, B+, Pi2B. This can appen if the voltage fl Dec 26, 2022 · Measure an analog voltage with the Pi Pico ADC in MicroPython (Updated at 12/26/2022) Some pins are connected to the internal ADC on the Raspberry Pi Pico. Known USB May 2, 2022 · Read: CUPS and Raspberry Pi AirPrinting. This means you connect it to ground and a supply of 3V3, and read the actual voltage from the middle pin. 5V/5A, 5V/3A limits peripherals to 600mA. Once you have access to the terminal through SSH or physical access, then you can proceed. Raspberry Pi Pico W ADC pinout Specifications of the ADC in Raspberry Pi Pico & Pico W. Thanks, Dan Oct 19, 2023 · By establishing a connection between your Raspberry Pi and an MCP3008 I/P chip, you can leverage the power of SPI to read a maximum of 8 analog inputs. 5A. To monitor the GPIO you would need to read its value. Known USB Oct 28, 2022 · The Raspberry Pi ADC Circuit. Serial peripheral interface (SPI) SPI hardware. In this video we will:* Exp Nov 21, 2015 · There is a full guide available with someone making a voltmeter setup here - this also includes scripts. The first diagram is for the most recent Pi v3 and Pi Zero models which have a 40-pin GPIO header. 12. temp_limit. Features. Usual mode Dec 8, 2021 · The data is divided into the value the Raspberry Pi OS gave me via vcgencmd measure_volts core (VDD_CORE) and vcgemcmd measure_volts sdram_c (V_DDR) labeled as Read out and the voltage I measured with my voltmeter directly at the PCB, labeled as Measured. Using the Pi only to control external electronics, with the Jun 16, 2019 · USB chargers are designed to be cheap, not to power a raspberry pi. Even if it’s not so much, it’s mandatory to work. I discovered this crazy device on YouTube and saw applications for my own Intrest. ADS1115 is a useful device to read multiple analog sensors with the Raspberry Pi, Arduino, or another microcontroller. Depending on what you are doing with the Pi, an Arduino may be a better choice as it has analog inputs built into the board. How to Power External Devices with Raspberry Pi. Jun 3, 2024 · Below we provide to wiring diagrams that will work with all versions of Raspberry Pi released so far (except the compute node which has no header). The current way that Raspbian does it seems to be by using a fairly recent mailbox function called RPI_FIRMWARE_GET_THROTTLED which returns a bitmask that indicates a number of things including whether an under voltage has occurred since startup and if Mar 29, 2015 · Does any one know what would be the best way of measuring input voltage? I am building an outdoor solar weather station and I would like to be able to remote into the PI and see the input voltage from the battery. 25 V Jul 6, 2016 · If you're using a later model Pi with a 40 pin GPIO header you'll need to double check the pin allocations. The Raspberry Pi 4 Model B (Pi4B) is the first of a new generation of Raspberry Pi computers supporting more RAM and with significantly enhanced CPU, GPU and I/O performance in a similar form factor, power envelope and cost as the previous generation Raspberry Pi 3B+. One is used for measuring VSYS voltage, and the other is used for controlling the built-in temperature sensor. qq uz br pe fo jm pg li kw fy