Microcontroller Sends Voltage and Frequency via Low-Cost Modules (.PDF Download)

This project pairs a set of 8-bit microcontrollers with a 433-MHz industrial, scientific and medical (ISM) band transmitter/receiver. The FS1000A RF transmitter has a range of up to 200 m; the XY-MK-5V RF receiver operates at 5 V and uses only 4 mA. These modules are readily available and used in projects with platforms like Arduinos.

The projects uses Microchip PIC microcontrollers including the 16F1619 and 16F1614. These utilize the radio modules employing the on-chip EUSART (Enhanced Universal Synchronous/Asynchronous Receiver Transmitter) interfaces. On the transmitter side, we use the PIC’s analog and digital interfaces to read a voltage and a frequency source within the range of 0 to 4.99 V dc and 0 to 65.5 kHz, respectively.