I am looking for a DAC in order to proportionally steer a power wheelchair using a raspberry pi model 3.
This means we have a power source of 5 V.
The wheelchair requires the voltage signals to be -1,2 to +1,2 V to go backwards and forwards . The resolution doesn't need to be especially high. Do I need a negative power supply as well?
I bought an AD5734, which I thought fits the mentioned requirements, however I don't get it to work. I soldered it to a PCB and connected it as well as I understood from the manual (The manual is not exactly a How To, which I probably need). What's the code I have to send? I tried hexadecimal, sending a "word" to address the output range select register and then sending a "word" corresponding to a certain output voltage I calculated. However I always measured 0 V on the output. Are there any other "words" I have to send first?
Sorry for the lengthy post.
Any help will be highly appreciated.