atoomnetmarc/n-teller2n-teller is an IoT device that displays the number of checked in participants and visitors at the hackerspace called Revelation Space (or RevSpace).
N teller is an open-source printed circuit board by atoomnetmarc, from the atoomnetmarc/n-teller repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 68.6 × 45.7 mm with 25 parts on 76 nets, routed with 199 tracks and 93 vias.
It is built around the 74AHCT125D and SS34. Its parts include 3 capacitors, 3 resistors, 3 ICs, 2 diodes and 1 switch. It belongs with the lEDs and displays and home automation and IoT boards and the ESP8266 boards of this library.
n-teller is an IoT device that displays the number of checked in participants and visitors at the hackerspace called Revelation Space (or RevSpace).
It connects to the RevSpace MQTT server via WiFi using an ESP8266.
The MQTT server publishes to a few topics of interest that are subscribed:
hardware/n-teller-schematic.pdf
See interactive BOM: hardware/bom/
You will also need:
In the 3d directory you can find a stand for the pcb.
Print n-teller-stand-w-usb-c-socket.stl. This will fit the optional USB Type-C Female Chassis Connector mentioned in the BOM. Or print n-teller-stand.stl and roll your own connection to 5V power supply.
Compile and flash the firmware located in the firmware directory. You will need PlatformIO for this. I recommend installing the PlatformIO extension for VSCode.
Double press the reset button (somewhat slowly). The letters AP will appear on the display. Now connect to a WiFi network with a name like nteller-bcddc2895fd2. Then go to: http://192.168.4.1/ and configure your WiFi.
PCB was designed to fit this type (pinout and dimensions) of 0.36" 4-digit 7-segment common cathode LED display:
| Model | Color | Tested |
|---|---|---|
| LFD036AAG-101 | green | |
| 3461AB | blue | :heavy_check_mark: |
| 3461AG | green | |
| 3461AGG | jade green | |
| 3461AO | orange | |
| 3461AS | red | |
| 3461AW | white | |
| 3461AY | yellow |
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | TP3, TP4, TP5, TP6 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C3 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP7, TP8 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D4.0mm | TP1, TP2 |
| 1 | 0.25A polyfuse | Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F1 |
| 1 | 100R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | 16V 470uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C2 |
| 1 | 33K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 3461AB 0.36" 4-digit 7-segment display common cathode | Display_7Segment-extra:3461 | D2 |
| 1 | 74AHCT125D | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | MAX7219CWG or MAX7219EWG | Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm | U3 |
| 1 | SS34 | Diode_SMD:D_SMA | D1 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW1 |
| 1 | Wemos D1 mini usb-c with 2x 1x08 pin headers and sockets | RF_Module-fixed:WEMOS_D1_mini | U2 |
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It measures 68.6 × 45.7 mm and has 2 copper layers, 1.6 mm thick.
25 parts, built around the 74AHCT125D and SS34. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the atoomnetmarc/n-teller repository on GitHub, at the commit this page was made from: the board is hardware/n-teller.kicad_pcb and its schematic hardware/n-teller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
