I am creating a device that has to house a small load cell (20mm diameter) and using an Uno to process the signal & spit out a reading. I have all of that worked out, using an HX711 as an amplifier, and with wired connections.
I now want to make this wireless with the smallest size (volume) of hardware actually on the device, transmitting to an Uno within 5 ft. The hardware directly attached to the Uno can be whatever size necessary - I just want to keep the device itself small.
What I have read so far is that the load cell needs to be amplified (HX711 on the device) which then puts out an amplified analog signal with a synchronized 'CLK'. This is read by the Uno which uses its built in ADC to put out a signal I can process.
My idea was to get a very small ADC (MCP3002) which can convert the HX711 signal, and then transmit that digital signal using a very small RF transmitter (WRL-10535). These three components would be on the device itself. Then, the receiver (WRL-10533) would be connected to the Uno for processing.
I was just wondering if this would work or if I am missing a step? I am not sure how the CLK pin works - since the RF transmitter only has one data line in, will transmitting the digital output alone (without any CLK data) be enough after it is converted by the ADC? Any input would be greatly appreciated! Thank you in advance.
What I have read so far is that the load cell needs to be amplified (HX711 on the device) which then puts out an amplified analog signal with a synchronized 'CLK'. This is read by the Uno which uses its built in ADC to put out a signal I can process
The HX711 is the right choice but it’s output is digital, not analog. You’ll need another Arduino (or just the microprocessor) to interface the HX711 output data stream with the transmitter.
My mistake, so better question would be - is there a way to transmit this digital information without the CLK data? The RF transmitter I was looking at only has one data line out.
HX711 produces a digital output - this is clocked out of the convertor one bit at a time and you need to save the numbers into , say, an array. Then transmit these values onwards through your rf.
Look at the library and examples for both devices.
Suggest you study the data sheets of by devices first
