Mini-General Purpose (GP) Wireless Sensor board The Mini-GP is an ATTiny85 based low power sensor board combined with a 433 MHz transmitter. If you are interested in playing with wireless sensors t...Read More…
The Mini-GP is an ATTiny85 based low power sensor board combined with a 433 MHz transmitter. If you are interested in playing with wireless sensors this is an inexpensive and easy way to get started. Because they are ATTIny85 based they are a little more difficult to program than their bigger brother the GP3 (no monitor or boot loader) but still simple once you get the hang of it. I have used both the USBTinyISP from AdaFruit (TM) and the Tiny Programmer from Sparkfun (TM) to program them and the ATTINY85 (External 8MHZ clock) board package in the Arduino IDE (TM).
While they are not as flexible as the GP3 board they are much smaller and less expensive. One analog/digital line is brought out to the connector and pads making it easy to connect to your sensor of choice. There is also a TO-92 mounting area for a DS18B20 digital temperature sensor IC. (See Note below.)
The Mini-GP is designed as a low power, battery operated, sensor that sleeps most of the time and wakes up once per “Interval” to send it’s status. If you are acquainted with the Arduino environment and would like to build your own custom wireless sensor this is an easy way to start. I have Arduino sketches available that demonstrate how to use the Mini-GP to communicate with an assortment of different sensing elements like: DS18B20 digital temperature sensor, tilt switch, moisture sensor, float switch light sensor etc. Use the sketches as is or adapt them to your custom sensor and your special needs. Contact me for schematics and sketches or for more information.
The internal resonator frequency drifts with temperature and battery voltage, it is necessary to use an external crystal to maintain reliable transmissions. Additionally, I use one pin to power the sensor on and off to extend the battery life and a pin to transmit data so we are down to only one sensor input. While the transmission protocol supports up to 5 sensors per node, the Mini-GP only supports one. The Mini-GP board is designed to work with a 3.0v CR2032 coin cell battery that should keep your sensor running for approximately a year. (Assumes the default reporting interval of approximately one transmission per hour). The Mini-GP typically draws about 4.6 uA while sleeping.
The Sensible Living Receiver and Desktop application (sold separately) are designed to work with the Mini-GP wireless sensor board. The Desktop App parses the received message, time stamps it, applies your scaling factor and provides a convenient way to see, monitor and track your sensors.
If you are interested in playing with wireless sensors this is an inexpensive and easy way to get started. These sensors are ATTIny85 based. They are a little more difficult to program than their bigger brothers (no monitor or boot loader) but still simple once you get the hang of it. I use the USBTinyISP from AdaFruit to program them and the ATTINY85 (External 8MHZ clock) board package. Contact me for schematics and sketches or for more information.
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Retired after 32 years in electrical engineering in Silicon Valley. Starting out in hardware engineering, embedded firmware, systems engineering and engineering management. I have worked for companies ranging from six employees to sixty thousand and managed development programs up to about $60 million. What i'm doing now is way more fun. I started this to learn about Arduino programming and one thing led to another. After building prototypes of these sensors for myself and some friends I decided to see if anyone else could use them. With a little luck I will make enough to buy a new scope. My old one still works but it was a discard when I got it 30 years ago and it takes a while for the tubes to warm up. :-)
I got the Rigol DS1102E. I love it! Just what I needed to develop and test my IOT sensor projects