Wireless Weather Sensors
From Makers Local 256
Overview
Designed to be simple to build, low parts cost, and low maintenance.
Needs:
- Wirelessly transmit temperature and relative humidity to a main unit.
- Run off a single AA, two AA, or a 9v battery
Wants:
- Two pins who's grounded status could be reported (think a door sensor, or something)
- Two pins that could be set to send 3.3v or 5v to run an relay
- Thermostat control?
Status
In progress
Parts
| Name | Price for 10 units | AVR pins required | Link | Alt Link |
|---|---|---|---|---|
| RFM22B-S2 Wireless Transceiver | $4.40 | 4(SPI) | http://www.hoperf.com/rf_fsk/RFM22B.htm | |
| DHT22 Humidity and Temperature Sensor | $8.96 | 1 (i think) | http://www.sparkfun.com/products/10167 | |
| Pressure Sensor | ? | ? | ? | |
| Battery case | ? | ? | ? |
AVR possibilites:
| Model | I/O Pins | Price per 10 | Link |
|---|---|---|---|
| ATTINY84 | 12 | $3.01 | http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ATTINY84-20PU-ND |
| ATTINY4313 | 18 | $2.80 | http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ATTINY4313-PU-ND |
