# OpenLog didn't start **URL:** \ **Category:** Other\ **Created:** [March 23, 2026, 8:21am UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378 "2026-03-23T08:21:33Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![alexandre56](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@alexandre56](https://community.sparkfun.com/u/alexandre56)\ **Post date:** [March 23, 2026, 8:21am UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/1 "2026-03-23T08:21:33Z")
Hello, I have an issue with my Artemis Openlog (SKU number : DEV-16832), When I use it by the USB port to a computer, it’s works well, it logs normally, But when I use it with an external 3V3 power supply, the LED blink only one time and the Artemis doesn’t start, sometimes, I can start it with the Reset button, but I need to push the reset button a few times to start it, I also try to put 5V on Vin, but, same problem, For your information, I measured some potentials: - RST: 4mV - 3.3 V: 3.3V - VCC\_ 1: 3V I tested without the micro SD card, and the LED blinks once. And I also tried with C2=10uF, but same… Thank you for your help, Alexandre ---
**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\ **Post date:** [March 23, 2026, 4:28pm UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/2 "2026-03-23T16:28:14Z")
Are you using soldered connections? Maybe share a photo of the working vs non-working setups ---
**Author:** ![alexandre56](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@alexandre56](https://community.sparkfun.com/u/alexandre56)\ **Post date:** [March 23, 2026, 4:59pm UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/3 "2026-03-23T16:59:14Z")
The RST level is same between the working and non working setup → 4mV ![Sans titre](https://canada1.discourse-cdn.com/sparkfun/original/2X/6/6b223dbc9fd4e2388b134f339be08aef10000cf6.jpeg) ---
**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\ **Post date:** [March 23, 2026, 7:58pm UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/4 "2026-03-23T19:58:47Z")
Do you have a qwiic-enabled mcu you can try with it? That appears wired correctly…did you happen to use external power + usb at the same time? ---
**Author:** ![alexandre56](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@alexandre56](https://community.sparkfun.com/u/alexandre56)\ **Post date:** [March 24, 2026, 8:13am UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/5 "2026-03-24T08:13:42Z")
Normally it’s not enable, because I didn’t use it. I tried with only an external power supply, only usb and both together, it’s the same problem. [OLA\_settings.txt](https://community.sparkfun.com/uploads/short-url/bXSjO8XpL0NoNWuYEJOR2nZNgMl.txt) (1.5 KB) ---
**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\ **Post date:** [March 24, 2026, 8:55am UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/6 "2026-03-24T08:55:25Z")
Both together can damage the board… " On the back of the board, you will notice that there is a pin labeled VIN. We don’t recommend it, but you can also feed in external power ( **recommended operating voltage of 6.0V Maximum** ) via the VIN pin next to breakout pin 11. We don’t recommend it because there is no protection diode between this pin and USB-C 5V power. If you have VIN and USB-C connected at the same time, bad things could happen. If VIN is your only option then we recommend [cutting the MEAS jumper](https://learn.sparkfun.com/tutorials/how-to-work-with-jumper-pads-and-pcb-traces#cutting-a-trace-between-jumper-pads) to isolate VIN from USB 5V and the LiPo." from [OpenLog Artemis Hookup Guide - SparkFun Learn](https://learn.sparkfun.com/tutorials/openlog-artemis-hookup-guide/hardware-overview) ---
**Author:** ![alexandre56](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@alexandre56](https://community.sparkfun.com/u/alexandre56)\ **Post date:** [March 24, 2026, 9:11am UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/7 "2026-03-24T09:11:59Z")
I only use both together when I configured the OpenLog. Now, the problem is the RST voltage level… it stay at 4mV, normally it’s 3.3V? ---
**Author:** ![paulvha](https://avatars.discourse-cdn.com/v4/letter/p/65b543/32.png) [@paulvha](https://community.sparkfun.com/u/paulvha)\ **Post date:** [March 24, 2026, 10:57am UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/8 "2026-03-24T10:57:30Z")
I have taken my Openlog and measured on the RST testpoint that is next to the uSD card in your picture. This testpoint is directly connected to the reset-switch. I measure 3V on reset signal either connected to USB OR connected to external battery. Doing an ohm measurement between GND and the RST testpoint when NO power is connected I get ~2M, which I would expect to be high. Measuring Ohm between the VCC\_1 and RST testpoint when NO power is connected, I get ~99.7K, which I expected from R28. The 4mV you measure looks **incorrect** to me. That it works on USB connection might the from Artemis\_RTS signal that triggers BOTH BOOT and RESET. ---
**Author:** ![alexandre56](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@alexandre56](https://community.sparkfun.com/u/alexandre56)\ **Post date:** [March 24, 2026, 12:52pm UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/9 "2026-03-24T12:52:55Z")
Between GND and the RST testpoint without any power supply, I measure 630kohms Between Vcc\_1 and the RST testpoint without any power supply, I measure 750kohms I agree with you about the RST level, it’s not normal… ---
**Author:** ![paulvha](https://avatars.discourse-cdn.com/v4/letter/p/65b543/32.png) [@paulvha](https://community.sparkfun.com/u/paulvha)\ **Post date:** [March 24, 2026, 12:59pm UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/10 "2026-03-24T12:59:44Z")
750K is incorrect high. Given the single R28 100K pull-up resistor between VCC-1 and reset. I also think the 630K is too low. I expect this board has a HW problem (either component or broken circuit). I would return it where you have bought it and ask for replacement. ---
**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\ **Post date:** [March 24, 2026, 8:53pm UTC](https://community.sparkfun.com/t/openlog-didnt-start/68378/11 "2026-03-24T20:53:30Z")
Was it purchased from us? If so head over to [Return Policy - SparkFun Electronics](http://www.sparkfun.com/returns) (contact vendor if purchased elsewhere) and we’ll get ya squared away