Node WND

Problem Statement

I want to test a temperature / humidity sensor on my porch that will tie into the Raspi datalogger and visualization system. I want to use the EZ430-CC2500 because they are cheap and I have template code written already in MSPGCC. I want to use the DHT22 because I have a couple, and it seems like an affordable solution. It should be powered from a solar panel or other harvested source.

Update: I want to measure the wind speed, and this sensor is already in an ideal location for a 3D printed anemometer. In any case it will make a great testbed. Update: I want to measure the rain, and this sensor *might* be in an ideal location for a 3D printed tipping bucket gauge. In any case it will make a great testbed. Update: DHT22 sucks - temp is good but humidity has drifted *WAY* off over the past two years of installation. Replace it with an SHT31?

System Overview

EZ430-CC2500 runs an MSP430F2274 and a CC430 chip for a 1mW 2.5Ghz radio, which I am running at 250kbps for short burst speeds and hopefully less packet collisions between various nodes reporting at random intervals.

Pinout

Pin 1 DHT GND
Pin 2 DHT Vcc (3.3V)

Pin 3 DHT1 Data
Pin 4 DHT2 Data

Pin 5 WND Data (must be filtered for bounce)
Pin 6 RAIN Data (must be filtered for bounce)

Pin 9 Solar Panel Voltage (3.3Vmax! divide by 2!)
Pin 10 Lipo Voltage (3.3Vmax! divide by 2!)

Port Definitions

#define VSOLAR BIT4 //on port 4
#define VBATT BIT5 //on port 4

#define DHT1 BIT0  //on port 2
//for future dual probes?
#define DHT2 BIT1  //on port 2

#define WIND BIT2 //on port 2
#define RAIN BIT3  //on port 2

//board resources
#define BUTTON BIT2  //on port 1
#define LED_RED BIT0 //on port 1
#define LED_GRN BIT1 //on port 1