v3.0.1

This release cleaned up the entire board design and increased user comfort.

• Added a switch for selecting application or bootloader

• Added Reset Button

• Option for manually forcing EN to VCC or GND using a jumper switch was removed. This is now controlled by the reset IC.

• Added a hole next to the battery so you can zip-tie the battery into its case. That's quite important if your setup is prone to falling.

• Reduced PCB size a bit to better fit into boxes

Warning

SDA/SCL of the connectors changed to untangle traces.

v2.0.1

Changelog

• Add C in front of Reset IC sensing line

Not optimal - but works for now. In the future I'll switch to a slower Reset IC but the required variant of the current one isn't available

v2.0.0

Changelog:

• Switched to semantic versioning

• Added a Reset IC that takes care of switching EN of the HT-CT62 if voltage before the 3.0v-LDO drops below 3.2v

Important

If you want to use the Reset IC: do not bridge the "EN" pin headers. The signal of this IC is "weak" - it can be overruled by a jumper without destroying the board.

V1.0

Only smaller changes:

• Replace LDO with 3V3 -> 3V0. We loose 1-2dBm of TX power but gain way longer run time. Also the native low voltage protection of Meshtastic will work now.

• Make silkscreen a bit bigger

v0.6

Bigger board changes this time:

• Lots of smaller non-functional changes reducing trace lengths to a minimum
• Replaced the CR123A battery with a classic 18650. The market of cheap CR123A 3.7V was just too small.
• Added a second I2C and also use proper Pull-Ups
• Using a thermistor with long legs instead of the SMD variant. This will be needed for temperature monitoring of unprotected LiPos
• Reduce jumpers to GPIO9 and ENABLE

Hopefully all bigger changes are done now - this one will be properly tested and then promoted to stable v1.0.0. Expect semantic versioning after this one.

v0.5

This fixes a thermal issue with the TI BQ25185:

Power supply tests showed that it's getting extremely hot when working with voltages >6V and a single Via below wasn't enough to get rid of the heat.

V0.4 - Testing

This PCB wasn't yet tested.

I don't expect something dramatically broken as only following changes happened:

• Moved the 4-pin JST connectors to the upper end
• Removed GPIO2 and GPIO8 pin headers as they are not needed for flashing and running the device
• Improved trace width and vias for everything power related
• Measuring VLOAD instead of VLIPO so we can see when the power path is switching to pass-through
• Added transistors for the LEDs