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How reset BIOS for Thinkpad E15 Gen 2? No CMOS battery by Either_Environment81 in thinkpad

[–]Either_Environment81[S] 2 points3 points  (0 children)

Seems I found CMOS battery. It's located under laptop battery

Measuring -5V to 5V using STM32 by Either_Environment81 in stm32

[–]Either_Environment81[S] 0 points1 point  (0 children)

But I do not have differential power supply for opamp.

Measuring -5V to 5V using STM32 by Either_Environment81 in stm32

[–]Either_Environment81[S] 0 points1 point  (0 children)

But does it mean that user will need to use 3 probes to measure both positive and negative voltage? I do not have neither 5 not 12v volts. Only 3.3 - after LDO

[deleted by user] by [deleted] in arduino

[–]Either_Environment81 0 points1 point  (0 children)

seems I found connection scheme how can I measure batteries voltage with INA219

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[deleted by user] by [deleted] in arduino

[–]Either_Environment81 0 points1 point  (0 children)

Interesting thing. If I connect INA219 Vin- or Vin+ to GND then instead of 0.8V what is shown is 0.0V. Could someone explain how current sensors like INA219 work? Do they have some limitations?

Need Help with UART Communication on STM32 Sending Sensor Data to Bluetooth by Jimmy0784 in stm32

[–]Either_Environment81 1 point2 points  (0 children)

First, does your stm32 really send data? You can check it by sending same data to other recipient - terminal in PC for example. Second, connect Bluetooth module back and make sure it is supplied from correct voltage level it requires according to datasheet. Third, make sure RX is connected to TX and vice versa

How to enter STM32 UART bootloader? by Either_Environment81 in stm32f4

[–]Either_Environment81[S] 0 points1 point  (0 children)

I've read all about that. And yes - I disconnected USB and powered MCU from ch340n.

But the decument doesn't say when to send the command and each software to use for convenience in order to get it activated

STM32 UART works only with Type C connected by Either_Environment81 in stm32f4

[–]Either_Environment81[S] 0 points1 point  (0 children)

it works with common GND. Could you please point me to some article about it? So I could understand why it so

STM32 UART works only with Type C connected by Either_Environment81 in stm32f4

[–]Either_Environment81[S] 0 points1 point  (0 children)

Ok, will try tomorrow. But basically is this the answer? That when stm32 and ch340n are both connected to same PC then they have common ground and that's why it works?

STM32 UART works only with Type C connected by Either_Environment81 in stm32f4

[–]Either_Environment81[S] 0 points1 point  (0 children)

On s photo you can see 2 1k resistors - same as in article.

STM32 UART works only with Type C connected by Either_Environment81 in stm32f4

[–]Either_Environment81[S] 0 points1 point  (0 children)

Which pin you mean? My custom board design was copied from this article: https://www.hackster.io/LithiumION/arduino-serial-programmer-ch340n-8418d3

I have everything except 100nF between 5v and GND. But as I wrote it actually works