HardLabs

MochiRadio

frankie-eight-days·mochiRadio

MochiRadio PCB layout, top view — open source AVR/Arduino board by frankie-eight-days

About the MochiRadio PCB

MochiRadio is an open source AVR/Arduino PCB design by frankie-eight-days, published on GitHub under the MIT license. It is a 2-layer board measuring 17.6 × 7.9 mm, with 4 components from 4 distinct parts.

Its main chip is the ATmega328P-MMH, from the AVR/Arduino family. Other key parts include the SI4455. By type, the board carries 2 ICs, 1 battery holder and 1 inductor.

It belongs with the rf & radio, sensors and iot & wireless designs in this gallery.

From the project

A 915MHz radio w/ temp sensor, pressure sensor, LED and ATMega328p

A coin-cell-powered 915 MHz wireless sensor node — an ATmega328P driving a Silicon Labs Si4455 sub-GHz transceiver, with onboard sensing and a hand-tuned RF matching network. Designed end-to-end in KiCad: schematic → impedance-matched RF front-end → PCB layout.

CoinCellSensor is a tiny battery-powered telemetry board: it wakes, samples its sensors, transmits a packet over the 915 MHz ISM band, and drops back to sleep to sip coin-cell power.

MochiRadio, from the project README
From the project README

Main components on the MochiRadio

SI4455ATmega328P-MMH

MochiRadio bill of materials (BOM)

4 components, 4 distinct parts.

QtyPartRefs
1
SI4455
U1
1
ATmega328P-MMH
U2
1
Battery_Cell
BT1
1
18nH
L6

MochiRadio design files

The KiCad project lives in the frankie-eight-days/mochiRadio repository on GitHub; these links point at the commit this page was built from.

MochiRadio: common questions

What microcontroller does the MochiRadio use?

The MochiRadio is built around the ATmega328P-MMH, from the AVR/Arduino family.

How big is the MochiRadio PCB?

The MochiRadio measures 17.6 × 7.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MochiRadio?

4 components, from 4 distinct parts. The full bill of materials is listed on this page.

Where can I download the MochiRadio design files?

From the frankie-eight-days/mochiRadio repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the MochiRadio design in my own project?

Yes, under the terms of its MIT license, which frankie-eight-days chose for the repository.

Can I test firmware for the MochiRadio without the hardware?

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

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