I am attempting to make a touchless keypad connection for a keypad. Pre-Covid people would walk up and use keypad (3x4 numeric) to select products to dispense. I would like to add a Bluetooth receiver (HM-10 connected to an Uno is what I have) that would take the ascii command from the Bluetooth app and relay it through the same harness as the physical keypad. Essentially replicating the keypad button press to another controller in the machine. I am thinking a y harness to add Uno and BLE.
I am a novice but have successfully wired the keypad to the uno and can see the keypad button presses via the serial monitor using the keypad.h library. I have also successfully wired the HM-10 to to Uno and am able to see ASCII commands sent via IOS BLE terminal app. I am struggling with how to send the Bluetooth data back through the 7 pin keypad serial connection.
I would be grateful for any assistance.