Solved-Issues with Pro Mini Boards

[papa]

Messages conversation between papa & Joshua

Joshua:  "Papa,  What do you think my issue may be? I'm trying to get a simple DHT node working on a pro mini. The setup and script works fine on an Uno; however, the mini will not pull the DTH values. The weird thing is that the debug is only readable at 230400 baud. Is it the IDE programmer? I'm sure it's something simple, but I can't dig into what it is. Maybe my recent move from TX to TN has me a bit more frazzled than usual .  Thanks"

Papa:  I'm not sure how to put together all the clues you provided. I'll try a bit (& again you may get more help on the open forum).  RFM69 radios are power hungry & the pro mini may not provide enough current for the radio, etc. I have used Buono Uno & MiniWireless, never the pro Mini. In the original schematics, computourist used pro Mini, BUT connected the radio directly to a 3.3 volt power supply not 3.3 volts on the pro Mini. That's where I suggest you start. See his schematic here: github.com/computourist/RFM69-MQTT-client/blob/master/DHT%20end%20node/DHT-node.png

Joshua:  "I'm experiencing the same issue with the MiniWireless. All boards are able to communicate with the gateway. Just the sensors are not working on the smaller boards. The Uno has the working sensors. Will you shoot me your IDE configuration for the miniwireless?"

Papa:    You might try an earlier IDE version. It's been a while since I programmed a MiniWireless, but I believe I selected Arduino/Genuino Uno board in the IDE.  I used an earlier IDE version for that, maybe 1.6.x.  I'm lately using IDE 1.8.8.  I usually don't upgrade IDE unless forced to or I'm setting up a new computer.  Using the IDE for the Pro Mini, I note that there are 8Mhz & 16Mhz options.  I had a DHT sensor on one Miniwireless & it worked fine.  I more often put DHT on a Buono Uno.  Again, computourist used a DHT sensor with a Pro Mini. Again compare your Pro Mini wiring with computourist schematic linked above.  Have you tried a known working DHT sensor on the smaller boards?

  Other forum members, what are your suggestions.

[Joshua]

Fixed... Here are the steps on Windows 7:

Backup sketches

1. Uninstall Arduino Software (IDE)
2. Delete "C:\Users\<username>\Documents\Arduino" (or other designated folder)
   
3. Delete "C:\Users\<username>\AppData\Local\Arduino15"
   
4. Delete "C:\Users\<username>\AppData\Roaming\Arduino15" (if exists)
   
5. Reinstall Arduino Software (IDE) (I installed 1.6.12)
   

Note: I did not add any old libraries. I imported new ones as needed.

As for the Anarduino MiniWireless, here are the setting that I used to upload a sketch.

• Board "Arduino Pro or Pro Mini"
• Processor "ATmega328 (5V, 16 MHz)"
  
• Programmer "AVRISP mkII"
  

[papa]

Thanks, Joshua, for reporting back on how you fixed the problem.

    One more question for clarification:

You said "Uninstall Arduino IDE ... I installed IDE 1.6.12"

What version did you uninstall?