RSSI Converter – Receiver channel to Voltage converter

 07/07/2014

Receivers such as the EzUHF can put the RSSI output (Receiver Signal Strength Indicator) on one of the receiver channels.

The problem is Data Logger circuits like the EagleTree expect a voltage range on the RSSI input to use with the display.

I needed a way to convert the output from the receiver to a compatible input to the EagleTree Data Logger.

By sampling the pulse width from the receiver and counting clock cycles, a count value to reflect the maximum count at around

2mS by choosing the appropriate sample rate, a value is produced between 0 and 255. This value is then complimented for this application.

An 8 bit DA converter produces 256 voltage levels between 0V and maximum output to produce a smooth linear slope across the entire range of pulse widths.

The converter has a linear output between 0V to near Vcc and can detect a pulse of just 8µS up to a little more than 2mS.

The circuit was designed to operate at +5VDC but can function between 2.3V and 6.5V.

Prototype samples are available now. Production to follow.