sonar feedback device for blind

potatoartist
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An ESP8266-based board with breakout for an HC-SR04, battery circuitry, and an i-bridge for controlling a vibrating motor.
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GNU General Public License v3 / GPLv3

Published: March 2, 2017 Complete

Project Description

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Project description
Warning! There is at least one mistake here. I made this circuit (ordered the PCB from oshpark) and it works, but I had to replace the cap on the 3.3v regulator output with a larger cap (22uf electrolytic) and more importantly the TX and Rx aren't swapped and they need to be.
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Component (11)
Qty
Description
ERJ-8GEYJ102V

laser_current_limiter

1
1 kΩ Resistor
GRM21BR71H105KA12L

1uf cap ldo input, C9

2
CAP CER 1UF 50V X7R 0805
ESP8266 ESP-12F

U90

1
WiFi Module
TPS2110PWR

Power Mux

1
Autoswitching Power Mux

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