nazirie WROTE:I'm already study about the encoder HT12E for 4-bits. my already circuit had a piezoelectric that detect force. the signal then amplified with amplifier. my condition here is that to grab that signal and send in wireless to the receiver. how i'm connect the HT12E to my circuit.
The circuit you used is designed for sending audio tone or voice to the other end. Audio has amplitude and frequency. But your piezo would only have a fix voltage level when a force is applied which is hard to interwork with your circuit. I guess your circuit is taken taken from a FM wireless MIC curcuits if I am not wrong.
To convert your force sensor to something that can be measured and transmitted by RF, my best guess is to convert it to a digital signal using an ADC. In your case where you dont want to use microcontrollers, the HT12E can transmit 4 bits at the same time so your transmitted force can have 16 levels ranging from lightest to heaviest. Though the measurement is fuzzy, it is still doable.
The connection is from sensor->ADC->HT12E-> Freq Mod of your Transmitter. On the receiving end you need the output of your RF receiver connected to a decoder HT12D->DAC->voltmeter.
Allen