crazyrobotsoftware.com writes : As an educational experiment, I decided to build a small temperature sensor, and data logger. Since I have little experience with direct Analog to Digital (A->D) converters, I decided to start out with a little more “meaty” hardware. I used a Basic Stamp II (BOE) BS2-IC microcontroller to capture temperature using a Sensirion Temperature and Humidity Sensor, and display using a 2×16 Serial Display.
PIC Microcontroller Temperature Sensor: [Link]
Bernie writes: The PIC12F675 looked like a good match for this project. The pair of 10k resistors on GP0 and GP1 are to allow in-circuit programming via a protoclip. RS-232 levels are generated by robbing the negative voltage from the computers transmit line (which is not otherwise used here), and creating usable signal levels from the device to the computer. For schematics and source codes visit the projects page.
PIC12F675 Magnetic Card Reader (for track2 credit cards ): [Link]
Synchronizing Fireflies is actually a board with 25 LED’s each of them going on and off when sensing light. This is done with a Light Dependant Resistor and a ATtiny13 micro-controller. Since the LED’s are placed close to each other, each LED influences the LED’s surrounding them creating a cool effect.
Synchronizing Fireflies: [Link]
The counter contains only three inexpensive ICs (well, add a regulator and three transistors), and operates from 6 - 15V DC at about 25mA. The most expensive single item is the LCD display, which is an industry standard 16 x 2 dot matrix module, which can often be found used or at bargain prices. This isn’t a kitset, but the parts are easily obtained, and the circuit can be built using any prototyping technique, or you could design your own PCB. The prototype was built on a small commercial strip board.
AVR Frequency Counter: [Link]
This altimeter was designed to be used for aircraft models. The main features of it are :
- Barometric sensing of air presure
- Barometric altimeter with 1 meter resolution
- Digital temperature sensing
- RC servo pulse decoding
- Low battery detection
AVR barometric altimeter: [Via] - [Download Project] - [View Project PDF]
