Node Spacedeur

192.168.6.29 cc:50:e3:8b:27:c7

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

SpaceDeur node

"Motherboard" with POESP and all ext. components connected

Mechanics

3D printed (openscad file lost in the midst of time ??, new version in the works)

with an ~40x40 NMEA motor -- 5mm diameter axle & 31x31 mount plate m3x45 depth in motor.

Mechanics - new version

new version being created (May 2025):

Assembly order:

1. Mount all inserts
2. Insert 5mm bearing
3. Insert the 4 bolts for the motor
4. Insert spool
5. Insert 5mm rod from top
6. Mount motor with the 4 screws; take a few turns each time; going round about 5-6 times in total before really tightening it
7. Push rod down; make to size & insert/tighten grub-screws
8. Mount switches

v1.03 - changes

1. Yellow; failed print; gap of 2 layers at 2/3. Cause unclear.

Issues:

1. Top hole about 0.3 mm off
2. Left switch could use a bit more space
3. Both switches could go a mm down or the lever a mm up to get more clearance to mount the bolt-inserts without the solder iron touching the lever.
4. Rope hole not ideally placed; more to the wall would align nicer.

v1.04 - changes

1. Move left/open switch 0.8mm to the left
2. Recenter bearing; correct bearing size: ZZ MR115-2RS; ID=5mm, OD=11MM, H=4MM.
3. Seriously thinner spring
4. Move rope further away; wider hole
5. Added extra holes/option to use smaller/low activation force AV3232613 microswitches
6. Colour: black

Todo:

1. Replace tie-wrap by wire tube holder

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. "Project Grote Schakelaar"
• socket for A4988-type stepper motor driver
  • Vmotor: 8 - 35V
  • Maximale stroom: 1A (2A piek)
  • Vlogic: 3,3 - 5V
• 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. "Project 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 Project 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

2025 - new wiring

2025 - wire motor/node

Wire between the motor and the node. There are connectors hidden behind the motor; these can be disconnected and are small enough to fit through 16mm standard PVC pipe.

Kleur	Stekker	Functie	Kleur UTP, Stekker eind
Blauw	Motor 1A, Zwart Male interconnect	UTP Blauw	Blauw, Stepper connector
Rood	Motor 1B, Red Male interconnect	UTP Blauw-Wit	Rood, Stepper connector
Groen	Motor 2A, Red Female interconnect	UTP Bruin-Wit	Groen, Stepper connector
Zwart	Motor 2A, Zwart Female interconnect	UTP Blauw	Groen, Stepper connector
Rood	End detect close, 3 pin interconnect	UTP Orange-Wit, Groen-Wit	IO-GND ?? Rood ??
Zwart	GND detect, 3 pin interconnect	UTP Orange	IOA ?? Geel ??
Geel	End detect open, 3 pin interconnect	UTP Groen	IOB ?? Zwart ??

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.

Updated 2022/2/21 with https://github.com/MakerSpaceLeiden/AccesSystem/releases/tag/cache-fix-2022-02-22-1.01

Stepper motor test script

      #include <AccelStepper.h>  // for the stepper motor.
      
      // Stepper motor-Pololu / A4988 - wiring
      //
      #define STEPPER_DIR (0)      // was 2
      #define STEPPER_ENABLE (12)  // was 4 // sleep
      #define STEPPER_STEP (2)     // was 5
      
      #define STEPPER_MAXSPEED (8000)
      #define STEPPER_ACCELL (3000)
      
      // Simple overlay of the AccelStepper that configures for the A4988
      // driver of a 4 wire stepper-including the additional enable wire.
      // and makes sure it comes on in the 'off' position. So we do not
      // get a loud 'click' on startup.
      //
      class PololuStepper : public AccelStepper {
        public:
          PololuStepper(uint8_t step_pin = 0xFF, uint8_t dir_pin = 0xFF, uint8_t enable_pin = 0xFF)
            : AccelStepper(AccelStepper::DRIVER, step_pin, dir_pin) {
      
            pinMode(STEPPER_ENABLE, OUTPUT);
            digitalWrite(STEPPER_ENABLE, LOW);    // dis-able stepper first.
            setPinsInverted(false, false, false);
            setEnablePin(enable_pin);
            setMaxSpeed(STEPPER_MAXSPEED);
            setAcceleration(STEPPER_ACCELL);
      
            // power it down - to prevent the stepper motor from
            // needlessly heating up (in the door closed position
            // the motor does not need to actively 'brake').
            //
            disableOutputs();
          }
      };
      
      PololuStepper stepper = PololuStepper(STEPPER_STEP, STEPPER_DIR, STEPPER_ENABLE);
      
      void setup() {
        Serial.begin(119200);
        // put your setup code here, to run once:
        stepper.enableOutputs();
      }
     
      int i = 0;
      
      void loop() {
        stepper.run();
        static unsigned long t = 0;
        if (millis() - t > 1000) {
          Serial.printf("%d -> %d\n", i, stepper.currentPosition());
          t = millis();
        };
        switch (i % 3) {
          case 0:
            stepper.moveTo(5000);  // specify end poistion.
            Serial.println("Start");
            i++;
            break;
          case 1:
            if (stepper.currentPosition() >= 5000) {
              stepper.moveTo(0);  // specify end poistion.
              i++;
            };
            break;
          case 2:
            if (stepper.currentPosition() <= 50) {
              i++;
            };
            break;
        };
      }

Troubleshooting

You can now telnet to the node. Or open a webbrowser on the node directly: http://192.168.6.29. This will you show you the log.

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) 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. (If that does not solve it, mail "noc", it might be a POE/network problem)
• 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)