Date Added: Jan 2011
Data AcQuisition (DAQ) and control system using telemetry method presents many advantages. In this paper, the authors have realized and analyzed low cost DAQ from multisensors using a 0.11 GHz Frequency Modulation (FM) telemetry, this frequency is classed on Radio Frequency (RF) waves. The realized circuit can be divided in two parts; transmitter and receiver. In the transmitter part, the detected physics quantities are water level measured using potentiometer sensor circuit and temperature measured using LM35 sensor. The analog signal conditionings are non inverting operational amplifier and the multiplexer circuit for choosing the inputs that will be transmitted. The digital signal conditioning has been firstly done by ADC0804 circuit, and then processed by AT89C51 microcontroller.