Now on to something a bit more adventurous but i need a bit of help and advice (if i thought it was confusing enough buying the bits - finding good info on all the terminology is much worse haha)
So my first project idea was an MQTT doorbell. I prised open my doorbell button but I suspect its NOT 433.9 MHz (the crystal had 26.x MHz on it) - no worries - plan B - the doorbell receiver has plenty of room inside to mount an ESP8266. On to the plan.
- mount an ESP8266 inside doorbell receiver (picture 3 below)
- power it via the internal 78M05 5V regulator on the doorbell PCB
- connect a point on the doorbell PCB (that signals "door bell has been pushed") to an input on the ESP
- connect (piggyback) the 3 other side buttons from the to the ESP
- Program it to send MQTT topic/payload on reception of doorbell push (I can do this bit no problem )
- Node-red instance to subscribe to MQTT topic and send telegram messages & trigger smart speaker (I can do this bit too :))
Fairly straight forward right?
Q. Can this Makerfire D1 Mini ESP8266 ESP-12F be powered via the
5V connectors? (picture below). The drawings/info isn't 100% clear & there are no sample wiring diagrams for this particular board
If not possible to power this board with 5V to
5V, what would I need to do to power this particular PCB?
Q. Which of the pins on this ESP PCB are actually usable as digital inputs?
- I have identified a point on the doorbell PCB that outputs +2.8V when "sounding" can I wire this straight to D0? etc. or do i need to something else before hand?
- The buttons (
>>) on the side of the doorbell appear to have 5V on them (un-pressed) and drop to zero when pressed - can these be connected straight to D2 D3, D4? etc. or do i need to something else before hand?
Can I make this re-programmable via WiFi? - once its all boxed up it would be nice to be able to re-program it via WiFi.
The note at the bottom of this picture suggests something can handle 5V
Also, I have a good selection of resistors / caps etc, the odd diode and a handfull of PN2222A (6E) general purpose NPN transistors if needed
Thanks for your time - its much appreciated (and needed), Steve.