The Argon/Xenon CHG pin: Tells us if an attached battery is “charging” or “fully charged” Tells us that the battery is “charging” when no battery is attached to the device I’m looking for a way to differentiate between “charging” and “no battery”. Is that possible to detect in firmware?

Similar questions have been asked and the combination of the state of the PWR and CHG pins should give you the info you need. https://community.particle.io/search?q=chg%20pwr

I used the test program in this post from @rickkas7 to produce the data listed below: Argon check power source? Scenario PWR CHG vBATT USB Power & Full Battery 1 = USB Power 1 = Not Charging 4.0 to 4.1 USB Power & No Battery 1 = USB Power 1 = Not Charging 4.1 to 4.2 No USB Power & Batte…

[image] Battery Charging Indicator - not working? BLE // NFC FYI, I’ve been doing this: hasUsbPower = digitalRead(PWR); isCharging = (hasUsbPower && !digitalRead(CHG)); onBatteryPower = (!hasUsbPower || !isCharging); Based on that if you have b…

I don’t know if this helps or not but I did something similar only to detect if there was USB power or not. I fed USB power into a digital pin that was pulled low with a pulldown resistor. As long as the digital pin had power going to it, it was in a high state. If power went out and now it was r…

[image] TimGTech: I fed USB power into a digital pin that was pulled low with a pulldown resistor. That would not be advisable on a Gen3 device - unless you make sure you get the USB power down to 3.3V as GPIOs on the nRF chip are not 5V tolerant. But this is what the (internal) PWR pin is f…

[image] ScruffR: Can you elaborate why you need to detect the (physical or electrical) presence of the battery? I now have a console to monitor the devices that I have deployed, but the firmware loaded on those devices was not written with monitoring in mind. That creates "an opportunity". M…

@ScruffR - Yikes! You are right and thanks for reminding me. I forgot all the Feather stuff is 3.3v logic. It doesn’t appear that there has been any damage. I threw a 10K resistor in there. I was reading thru the Docs and Datasheets and could not find much on the PWR pin. Could you elaborate o…

[image] TimGTech: I threw a 10K resistor in there A single resistor won't protect you agains over-voltage on the pin. You'd need a voltage divider. Since an INPUT pin does virtually draw no current you won't get any considerable voltage drop across a series resistor. The only thing you need…

@ScruffR : I suppose you are right about the voltage divider. But sounds like I don’t need any of that. Just read PWR if it HIGH or LOW state. I came across something that mentioned in another thread doing that on an Argon but on a Boron you have to do something different. Does PWR work the sam…

[image] TimGTech: I came across something that mentioned in another thread doing that on an Argon but on a Boron you have to do something different. I think you are refering to reading the SoC and voltage of the battery since Argon and Xenon don't feature a fuel gauge while the Boron does. I…

Can we detect if a battery is connected to the Argon/Xenon

Firmware

Fragma April 10, 2019, 11:21pm 4

Topic		Replies	Views
Argon check power source? Firmware argon	8	4005	October 13, 2023
Monitoring Argon external battery status : pin BATT, CHG and PWR, where I can find them? Hardware argon	2	319	July 26, 2023
Battery Charging Indicator - not working? BLE // NFC xenon	8	3047	March 22, 2019
Question about Particle Argon BATT, CHG and PWR digitalRead() Firmware argon	2	37	April 8, 2026
Understanding PWR and CHG on a Xenon Firmware	8	1515	September 6, 2020

Can we detect if a battery is connected to the Argon/Xenon

Related topics