Hi,
I have connected a Up2Stream device to my Arduino controlled Tube Amplifier.
For streaming I use the Up2Stream board. (Wifi Audio Receiver with Multi zone Control-Arylic.com).
Manual of the board can be found here: https://cdn.shopify.cn/s/files/1/0072/6899/1049/files/Up2Stream_Mini_V3.0_Manual-en.pdf?v=1591605095
I am using the PH2.0 connector 1. Using Pin 5 and Pin 7.
The board has an option to control it by connecting a 3.3v source with ground with a 10k resistor and various resistors for each function. F/E 100R resistor changes from Wifi to BT and vice versa. 1K resistor is play pause.
I would like to control this with my Arduino; however, how can I connect the 3.3V with the 10K resistor to a common ground switching with the Arduino? I tried a BC547 transistor. That works fine with leds and relays. But the transistor has its own resistance, so the audio board does not get the correct resistance. How can I connect very clean GND with the 100R resistor to the Audioboard ground using the Arduino digital ports?
Thank you in advance for your help!