HardLabs

N teller

atoomnetmarc·n-teller·hardware/n-teller.kicad_pcb

N teller PCB layout, top view — open source ESP8266 board by atoomnetmarc

About the N teller PCB

N teller is an open source ESP8266 PCB design by atoomnetmarc, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 68.6 × 45.7 mm, with 10 components from 9 distinct parts.

Its main chip is the WEMOS_D1_mini, from the ESP8266 family. Other key parts include the 74AHCT125D and MAX7219CWG or MAX7219EWG. By type, the board carries 3 ICs, 3 capacitors, 2 diodes, 1 fuse and 1 resistor.

It belongs with the iot & wireless and displays & leds designs in this gallery.

From the project

n-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 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:

- revspace/doorduino/checked-in: this is the current total checked people. - revspace/state: the current state (open or closed) of the hackerspace.

N teller, from the project README
From the project README

Main components on the N teller

74AHCT125DMAX7219CWG or MAX7219EWG

N teller bill of materials (BOM)

10 components, 9 distinct parts.

QtyPartRefs
1
74AHCT125D
U1
1
Wemos D1 mini usb-c with 2x 1x08 pin headers and sockets
U2
1
MAX7219CWG or MAX7219EWG
U3
1
0.25A polyfuse
F1
1
SS34
D1
1
3461AB 0.36" 4-digit 7-segment display common cathode
D2
2
100n
C1, C3
1
16V 470uF
C2
1
33K
R3

N teller design files

The KiCad project lives in the atoomnetmarc/n-teller repository on GitHub; these links point at the commit this page was built from.

N teller: common questions

What microcontroller does the N teller use?

The N teller is built around the WEMOS_D1_mini, from the ESP8266 family.

How big is the N teller PCB?

The N teller measures 68.6 × 45.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the N teller?

10 components, from 9 distinct parts. The full bill of materials is listed on this page.

Where can I download the N teller design files?

From the atoomnetmarc/n-teller repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the N teller design in my own project?

Yes, under the terms of its Apache-2.0 license, which atoomnetmarc chose for the repository.

Can I test firmware for the N teller without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.

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