I'm looking to send an ascii string over I2C in node-red to a Atlas Scientific pH I2C module.
I currently have tried using the node red contrib gpio and i2c. I am able to send the command r as ascii number 114 and get a response.
But when I try the command sleep it does not work.
I have tried to send it as an array, individual ascii numbers with delays, a string of numbers, all as one number, with null byte.
None has worked so far, the manual says that the commands consist of 5 parts.
Start-I2C address-Write-Command(ascii command string)-stop.
In the SDA and SCL diagram it shows,
address bit->write->ack->first letter of command->ack->......->last letter of command->ack->stop.
Am I inputting the data in the wrong format or is there a problem with the i2c node waiting for the ack before sending the next letter?
Formatting the command as a hex array through the function node worked.
[0x73,0x6c,0x65,0x65,0x70]