4.2″ Chroma 42

Nic Limper edited this page 2024-09-05 20:25:27 +02:00

Table of Contents

• Specs
• Status
• Programming
• Board Revisions

Specs

• TI CC1110 - 26Mhz 8051 32kB Flash / 4kB RAM
• 3.3 x 2.5 in ePaper display (BWR or BWY) 400x300px
• Dual UC8154 like EPD controllers with support 3 bits per pixel or
• UC8176 like EPD controller with support for 2 bits per pixel
• 1 Mbyte SPI flash
• 4x CR2450 button cell
• SubGhz (868 Mhz / 915 Mhz) Radio
• FCC ID: VC7120-0129

Status

A beta version of OpenEPaper firmware for edk288 Issue 2 and Issue 4 PCBs are available.

It is possible that the beta will work with versions not listed in the chart below, if you test the beta on another board issue please report your finding if it works or not.

The firmware images are available here.

Programming

See Flashing CC1110 Based Chroma tags for information on how to flash custom firmware onto the Chroma42.

Board Revisions

SN Format	Colors	Board Rev	Controller	EPD Panel	Supported	FW image base name	Notes
"JC0xxxxxxxB"	BWR	edk288 Issue 2 220-0073-02 2014	Two UC8154s in cascade mode	WF0420T1PBF04	Y	chroma42
"JH0xxxxxxxB"	BWY	edk288 Issue 2 220-0073-02 2014	Two UC8154s in cascade mode	unknown	maybe	chroma42	1, 2
"JC1xxxxxxxB"	BWR	edk288 Issue 4 220-0073-04 2018	UC8176	WFD0420BF15	Y	chroma42_8176
"JH1xxxxxxxB"	BWY	edk288 Issue 4 220-0073-04 2018	UC8176	WF0420T8DBF150E42	Y	chroma42_8176

1. The "chroma42" image has LUTs for a BWR display, a BWY display will work, but yellows will be washed out.
2. Compatibility has NOT been verified. Please let us know if it works!