4

My personal preference would be to attach a NOT gate to the RESET pin. This can be constructed very simply from a single NPN transistor (or N-channel MOSFET) and a resistor. simulate this circuit – Schematic created using CircuitLab With the wire disconnected R1 turns on Q1 which pulls the RESET pin LOW. With the wire connected Q1 is turned off, ...


3

Hadn't pushed the button all the way in lol


3

I would say it was "stable but not accurate". The internal reference uses a bandgap voltage reference, which is pretty stable over the operating temperature range of the IC. The output of the bandgap reference is fed through an amplifier to buffer it, which may introduce some instability with temperature, but this is not documented so cannot even ...


3

Finally find the solution =) You don't have to change the ID vendor or ID product: it is possible to attribute a permanent name with devpath (where the device is plugged) The only downside of using the devpath is that the devices will always have to stay plugged into the same physical port. Answer here:PersistentUSBDevices / Alternative filtering via Devpath


1

So you had: SCK frequency to 1500000 And I suggested lowering to the point where you: set it to 8k solved it:) Good deal. The thing that you were likely running afoul of is the maximum ISP clock rate, which according to the datasheet for the ATMega328P (or practically any other AVR for that matter) is determined by some rules: Low:> 2 CPU clock ...


1

See Rules and guidelines for drawing good schematics on electronics.stackexchange.com. I'm no expert but perhaps some of what I have found will be of help. To produce a clear easy-to-read useful schematic it doesn't really matter what tools you use. This website has a reasonable schematic editor so I suggest you could try that to start with. Other tools I ...


1

If you want measuring a "battery level" in mAh for example, you must measure Voltage AND Current, so INA219 is a better deal (it is a I2C control).


1

The easiest way to do that would be to use an external pulldown resistor (a resistor from the reset pin to ground) and connect to Vcc (5V on the Nano) via your alligator cables. As long as the alligator cables are connected, the reset pin is held HIGH through them. When you disconnect them, the pulldown resistor pulls the reset pin to LOW. That holds the ...


1

I have faced a similar issue. It happened due to an SSL issue. You can find all info about it here - https://stackoverflow.com/questions/62950561/sim800l-gsm-module-working-with-http-and-shows-error-with-https-why


1

I use Chinese clone nRF24L01. It has very narrow voltage tolerance. My Arduino is also clone. The 3.3V output voltage was 3.27. The nRF24L01 was not working. I added a 3 terminal regulator between Arduino 5V output pin and nRF24L01. The voltage was 3.303V. Then nRF24L01 was working normally. /////////////////////////////////////////////// #include <SPI.h&...


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