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ESP distance measurement

alexelmi·ESP_distance_measurement·Hardware/KiCad_Files/Distance_Measurement_V2.kicad_pcb

ESP distance measurement PCB layout, top view — open source ESP8266 board by alexelmi

About the ESP distance measurement PCB

ESP distance measurement is an open source ESP8266 PCB design by alexelmi, published on GitHub under the MIT license. It is a 2-layer board measuring 116 × 64 mm, with 8 components from 8 distinct parts.

Its main chip is the WeMos_D1_mini, from the ESP8266 family. By type, the board carries 2 resistors, 1 IC, 1 transistor, 1 connector, 1 battery holder and 1 speaker.

It belongs with the test & measurement designs in this gallery.

From the project

handy distance measurement with ESP8266

A tiny handheld ultrasonic "distance radar" built on a WeMos D1 mini. The closer you hold it to an object, the faster it blinks and beeps.

So I sat down and designed the circuit and the PCB in KiCad:

The next day we put the components together and loaded the first test sketch onto the WeMos D1 mini. (I have to admit I didn't test it before. 🙂)

- Ultrasonic distance measurement (~2 cm … 5 m) with an HC-SR04. - LED + buzzer feedback that speeds up as the object gets closer; solid when very close and silent when nothing is in range. - Distance also printed over Serial at 115200 baud.

ESP distance measurement, from the project README
From the project README

Main components on the ESP distance measurement

WeMos_D1_mini

ESP distance measurement bill of materials (BOM)

8 components, 8 distinct parts.

QtyPartRefs
1
WeMos_D1_mini
U1
1
2N5109
Q1
1
Conn_01x04_Female
J1
1
18650
BT1
1
Speaker_Crystal
LS1
1
LED
D1
1
220
R1
1
1k
R2

ESP distance measurement design files

The KiCad project lives in the alexelmi/ESP_distance_measurement repository on GitHub; these links point at the commit this page was built from.

ESP distance measurement: common questions

What microcontroller does the ESP distance measurement use?

The ESP distance measurement is built around the WeMos_D1_mini, from the ESP8266 family.

How big is the ESP distance measurement PCB?

The ESP distance measurement measures 116 × 64 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP distance measurement?

8 components, from 8 distinct parts. The full bill of materials is listed on this page.

Where can I download the ESP distance measurement design files?

From the alexelmi/ESP_distance_measurement repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the ESP distance measurement design in my own project?

Yes, under the terms of its MIT license, which alexelmi chose for the repository.

Can I test firmware for the ESP distance measurement 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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