Moving from breadboard to solder

Projects General Guidance
1

I’ve been working on my first project since Christmas on a breadboard and learning how to use IDE.

It consists of:

Wemos Lolin ESP32 lite

Micro SD card

Bme280 temperature and pressure sensor

DHT22 temperature and humidity sensor

I’ve got to the point that I was confident enough with the project to put it on a soldered board.

Everything works fine other than the DHT22, in fact the SD card is working like a dream now that it is soldered rather than on a breadboard.

The DHT22 is not showing any readings at all, I’ve double checked my soldering and my wiring paths by eye and with a multimeter and everything looks fine.

The only difference between my breadboard model and my soldered model is that I have changed from using GPIO17 to GPIO25 for the DHT22 and changed the sketch to suit.

Can anybody see any reason that using pin 25 would cause a problem?

The only other thing that I have considered is that the DHT22 is faulty, and I am kicking my self now for not trying in on my prototype before soldering it. Is it common that components may be faulty?

2

It's not uncommon for them to be damaged during installation - owing to inexperience, etc.

3

did you try wiring it to pin 17 again? I don't know the Wemos Lolin ESP32 lite, may be pin 25 has some other usage

4

This is the signal signatures of ESP32 Wemos Lolin Lite Board. The DPin-25 should work as a GPIO without any reservation.

ESp32 Wemos Lolin lite
ESp32 Wemos Lolin lite1555×732 156 KB

Figure-1:

5

The first thing I am going to try is changing to pin 17 as this will require less desoldering.

If that doesn't work I'll try another DHT22, I've got a few. This time though I'll check it in my prototype.

Thanks for the advice.

6

I've soldered the DHT22 as close to the board as possible thinking that this would make it more stable, would a gap be prudent as the pins are long enough?

image
image982×612 40.4 KB

7

First, check the DHT22 using an Arduino UNO and then connect it with ESP32.

8

It's working. Changed from pin 25 back to 17 and amended the sketch and everything works fine.

9

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.