HardLabs

Soylent

kulp·soylent

Soylent PCB layout, top view — open source AVR/Arduino board by kulp

About the Soylent PCB

Soylent is an open source AVR/Arduino PCB design by kulp, published on GitHub. It is a 2-layer board measuring 17.8 × 22.9 mm, with 24 components from 15 distinct parts.

Its main chip is the ATtiny202-SS, from the AVR/Arduino family. Other key parts include the LM2776, LT1761-5, MAX3314EEKA-T and LM2904. By type, the board carries 9 resistors, 5 ICs, 5 capacitors, 4 connectors and 1 jumper.

From the project

An aspirational hardware design for a tiny (300-baud FSK) modem for the TI Silent 707 teletype

soylent is an "aspirational" (i.e. entirely untested, and designed by an electronics neophyte) hardware design for a tiny hardware modem for the TI Silent 707 briefcase teletype from the Texas Instruments Silent 700 series.

The teletype speaks 300-baud FSK using the Bell 103 dataset. The modem is designed to connect directly to the acoustic-coupler interface of the teletype, which supplies power to the modem as well as providing the FSK audio signal. The modem is designed to implement full-duplex translation between the FSK signal and a minimal RS-232 serial connection at 300bps.

Soylent, from the project README
From the project README

Main components on the Soylent

ATtiny202-SSLM2776LT1761-5MAX3314EEKA-TLM2904

Soylent bill of materials (BOM)

24 components, 15 distinct parts.

QtyPartRefs
1
ATtiny202-SS
U1
1
LM2776
U2
1
LT1761-5
U3
1
MAX3314EEKA-T
U4
1
LM2904
U5
1
Conn_01x03
J1
2
Conn_01x04
J2, J3
1
ACST CPLR
J4
1
Jumper_2_Bridged
JP1
2
2.2u
C1, C4
1
1u
C2
1
0.01u
C5
1
47u
C6
1
4k7
R3
8
50k
R4, R5, R6, R7, R8, R9, R10, R11

Soylent design files

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

Soylent: common questions

What microcontroller does the Soylent use?

The Soylent is built around the ATtiny202-SS, from the AVR/Arduino family.

How big is the Soylent PCB?

The Soylent measures 17.8 × 22.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Soylent?

24 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the Soylent design files?

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

Can I use the Soylent design in my own project?

The repository has no license, so all rights stay with kulp. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Soylent 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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