Node Spacedeur

PoE powered Node on Ethernet for the door of the Space itself.

SpaceDeur node

"Motherboard" with POESP and all ext. components connected

Electronics

Todo: Add schematic / POESP pinout NB: currently POESP v1.1 is used, as the USB/UART and Eth ICs are heating much less in this version. Schematics is for v1.0 (any major differences?)

On the motherboard there are:

• resistor between "Set V++" and GND, setting the voltage output for the stepper motor ("Vmot" terminal of A4988) to 12V
• transistor for amplifying the pulses on GPIO16 for the buzzer
• pull-up resistor for MS1, ensuring the motor is making half-steps (?)
• R-C circuit for the a.k.a. "Grote Schakelaar"
• socket for A4988-type stepper motor driver
• header for the POESP board
• 8-pin RFID reader connector (brown/red pin is rightmost)
• 4-screw terminal for the stepper motor
• 2-screw terminal for powering auxillary devices (not connected)
• 2-pin terminal for the buzzer, which sounds when RFID is read successfully
• 2-pin terminal for the a.k.a. "Grote Schakelaar". High when switch is off (or wire broken). Goes low when the switch is on.

Pinout of the RFID reader connector

pin	function
1	SDA
2	SCK
3	MOSI
4	MISO
5	IRQ
6	GND
7	RESET
8	3v3

Pinout of ESP32

ESP GPIO	function
2	Stepper DIR
4	Stepper Enable
5	Stepper STEP
16	Buzzer
34	Grote Schakelaar
13	MOSI
12	MISO
14	SCK
15	SDA
32	RESET (optioneel)
33	IRQ (optioneel)

Stepper screw terminal

see labels on each wire, match with those on terminals

Pin	functie
1	A - kleur onbekend
2	iA - kleur onbekend
3	B - kleur onbekend
4	iB - kleur onbekend

Grote Schakelaar header

Cabling to the Grote Schakelaar; met deze [code].

Wiring:

Pin	function
1	Switch; pulled up; to pin 34 of ESP 32
2	Digital ground

Interpretation of the voltages:

Value	Interpretation
low	Handle in horizontal position - space closed.
high	Handle in vertical position -- open.

2-screw terminal

Pin	function
1	12Volt
2	power ground

Software

Software: https://github.com/MakerSpaceLeiden/AccesSystem/blob/master/lib-arduino/ACNode/examples/SpaceDeur/SpaceDeur.ino

Todo: currently Grote Schakelaar does not work (ESP needs to be coded to use GPIO34 signal / send info to MQTT). Partially coded up at https://github.com/MakerSpaceLeiden/AccesSystem/compare/master...dirkx:master -- but not tested yet.

Troubleshooting

Before unplugging anything else, always unplug the ethernet connector from the POESP board FIRST!

Never disconnect the stepper motor wires from their screw terminals if the ethernet cable is connected / system is powered

1. Reset the node by unplugging, counting to 30, and then re-plugging the (hopefully labeled, otherwise see space network diagram) (Todo: add link) PoE cable in the server cabinet. Check the green light on the POESP board. Wait 60 seconds before trying the RFID tag.

2. If the light on the POESP board is not on/green:

• disconnect ethernet. Disconnect stepper, RFID, and buzzer/schakelaar from the motherboard. Reconnect ethernet.
• If no light, disconnect ethernet and remove the A4988 stepper driver. Reconnect ethernet.
• If no light, unplug the POESP board from the motherboard, connect ethernet.
• If POESP led lights up - troubleshoot the corresponding module/connection.
• If POESP led does not light - POESP is dead. Get a spare from the read shoe box in the lower left drawer next to the electronics table.
• Inform "deelnemerlijst" (all members) of the situation, and make sure there is a spare POESP with firmware in the red shoe box when you are done.

(Todo: add instructions on how to upload firmware to POESP)