There are so many out there now. I thought I would pick the brains of the experimenters familiar with them.
I was going to use an Arduino Nano for my project but it runs on 5V and my solar cell supply is good for about 4V.
In this way it is self-contained and battery free. (Only needs to work during mid-day.)
So here are my desired traits:
-Will run on 3.3 Volts.(power is 4.5V max solar cell charging a 1.5 Farad capacitor)
- Is mounted on a board with required peripheral chips like a Nano
- Can be programmed with Python or microPython (I don't like antiquated C and Python looks learnable).
- Board size about the same as a Nano.
- Can communicate easily with I2C sensors
- Low complexity and low cost
My application reads a humidity/temp sensor board like the SHT31 (link below) and inputs the data into an RF transciever
such as the HC-12 (eBay). Initially I was hopeful that I could find a sensor that would just power-up sending humidity
and temperature data that I could wire directly into the transmitter but I can't so I need a simple micro between them.
Do I need a zener diode to limit the input voltage to 3.3V? or is 4V OK. I have never used a 3.3V device.
Sensor link: https://www.adafruit.com/product/2857 This sensor has a fast 1 second response time which I need.
HC-12 data sheet attached.
Thanks for your assistance!
I was going to use an Arduino Nano for my project but it runs on 5V and my solar cell supply is good for about 4V.
In this way it is self-contained and battery free. (Only needs to work during mid-day.)
So here are my desired traits:
-Will run on 3.3 Volts.(power is 4.5V max solar cell charging a 1.5 Farad capacitor)
- Is mounted on a board with required peripheral chips like a Nano
- Can be programmed with Python or microPython (I don't like antiquated C and Python looks learnable).
- Board size about the same as a Nano.
- Can communicate easily with I2C sensors
- Low complexity and low cost
My application reads a humidity/temp sensor board like the SHT31 (link below) and inputs the data into an RF transciever
such as the HC-12 (eBay). Initially I was hopeful that I could find a sensor that would just power-up sending humidity
and temperature data that I could wire directly into the transmitter but I can't so I need a simple micro between them.
Do I need a zener diode to limit the input voltage to 3.3V? or is 4V OK. I have never used a 3.3V device.
Sensor link: https://www.adafruit.com/product/2857 This sensor has a fast 1 second response time which I need.
HC-12 data sheet attached.
Thanks for your assistance!
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