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Detailed tutorial from Adafruit on how to use the TCS34725 with arduino including example code and wiring
The 74HC191 are asynchronously presettable 4-bit binary up/down counters
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Two set screws can be used to attach it firmly to any 8 mm diameter shaft
Quick Overview
GSM-GPRS Arduino SIM900 ( you can test it before buy ) DC fan 5V Detailed tutorial from Adafruit onGSM GPRS MODULE is an ultra compact and reliable wireless module. It is based on SIM900 4 Frequency GPRS module. The GSM GPRS Shield is configured and controlled via its UART using simple AT commands. Module have two set power supply interface VCC5 5V power supply, VCC4 interface, 3. 5 4. 5V power supply, optional power on self starting (default) and control start. The MODULE allows you to achieve this via any of the three methods: Short Message