I want to create remote temperature and humidity sensor.
SENDER (This is my station for transmitting sensor data)
I have arduino pro mini 3.3v 8 mhz (i have removed power led) + DHT22 + nrf24l01
RECEIVER (this is my station for receiving sensor data)
arduino uno + nrf24l01
when i use Arduino uno (RECEIVER) as power source for SENDER everything works! I get data from SENDER to RECEIVER by RF radio. But when i connect SENDER to 2x AA batteries or to USB-UART converter to 3.3v pin + GND it does not work.
If i replace SENDER and RECEIVER codes and connect DHT22 to Arduino uno (thus making Arduino UNO setup SENDER) then my other setup with only Arduino pro mini + nrf24l01 gets data no matter what is power source. Be it arduino unos 3.3v pin, 2xAA batteries, 18650 battery or USB-UART converters 3.3 v pin.
WTH is going on? I understand basics of electronics and i am programmer so code is not a problem (code works as i described) problem is when Arduino pro mini is SENDER it does not work if power source is not Arduino UNO (3.3 v pin and GND)
Please provide a wiring diagram of your complete setup. I guess that the batteries are not able to provide the necessary current and the voltage drops. Did you check the voltage on the Micro? You might need 3 AA batteries and a DC/DC converter to stabilize the voltage.
pylon:
Please provide a wiring diagram of your complete setup. I guess that the batteries are not able to provide the necessary current and the voltage drops. Did you check the voltage on the Micro? You might need 3 AA batteries and a DC/DC converter to stabilize the voltage.
I also added 10 microfarad capacitor to VCC and GND pins on nrf like someone suggested me on other forum.
I disconnected DHT for now. I just want to send string from arduino pro mini to uno with nrf.
I have attached nrf like this to both of arduinos.
Pin 9 -----------CE
Pin 10 --------- CS(N)
Pin 11 ---------- MOSI
Pin 12 --------- MISO
Pin 13 ---------- SCK
3.3v ------------- VCC
GND ------------ GND
It works if i send string from uno to mini. It also works when i have mini attached to unos 3.3 v and GND as power source for mini. BUT if i use batteries or any other power source for arduino mini i can't send anything from mini to uno.
What battery or "any other power source" (the latter is contradictory as it would include the Uno which does work), and how are they connected to the Pro Mini?