The heart of the circuit consists of the integrated MCP2221A produced by Microchip . This integrated is cataloged as USB 2.0 to I2C / UART Protocol Converter with GPIO or a protocol converter from USB to UART and I2C with IO having customizable functions.
You can use it as a bare Serial (only RX and TX) to USB converter such as the adapters based on FT232R, CH340G, PL2303, but have also some functions extra: it can act as Master on an I2C bus and there is also an Android Application with source code for this! You can read the documentation following the link in this project.
I've made also some video tutorials showing the usage of android app for I2C and UART communication:
Bill of materials used in this project
resistor 220Ω ¼W
4
resistor 2200Ω - 4700Ω ¼W or empty
2
depending on I2C bus/speed
2
electrolitic capacitor 220µF 16V
2
multilayer_ capacitor 220nF (pitch 2.5 ÷ 5mm)
2
multilayer_ capacitor 100nF (pitch 2.5mm mandatory)
1
tactile switch 6x6mm
1
MCP2221A/P
1
LM1117-3.3 (LD33) TO-220
2
3mm round red led
1
3mm round green led
1
3mm round yellow led
1
Jumper
1
USB type B connector
1
Apr 30,2020
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UART+I2C USB Bridge
2 Layers PCB 29 x 58 mm FR-4, 1.6 mm, 1, HASL with lead, Yellow Solder Mask, White silkscreen
A simple and cool adapter from UART (Rx, Tx) and I2C to USB compatible with Windows, Linux, MAC and Android. Source code for Android.
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Published: Apr 30,2020
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