The emontx v2 currently uses different 3.5mm jacks to the emontx v3 and emontx shield, It also required a different case which needed milling to use. To try and standardise on the components required I've been working on a new version that is designed to fit in the emonTH case that doesn't require milling and uses the higher quality 3.5mm jacks used on the emontx v3 and emontx shield.
As I got stuck in to the design I thought Id add the powering via AC circuitry that's on the emontx v3 and find a way of ensuring all spare IO is available + the addition of a row of terminal blocks with power, ADC's and digital IO breakout in much the same style the EmonTH.
The first revision of this new design is now available on github here:
and looks like this (im really quite pleased with how it turned out, there's something quite satisfying about designing and routing together a pcb, trying to find neat layouts and so on):
The main features are:
- 2x CT sensor inputs using higher quality 3.5mm jacks used on the EmonTx v3 and emontx shield
- 1x ACAC Voltage sensing and power input
- Terminal block power, ADC's and Digital IO breakout + full spare IO breakout.
- Onboard DS18B20 footprint
- Based around ATmega328 + RFM69 core
- Fits in emonTH enclosure
I've sent off for a first prototype PCB from ragworm so will be building and testing this design hopefully next week. Id welcome thoughts on the design and any suggestions and may do another revision before getting these made in quantity.
Common component kit
The other idea we've had is that since the emonglcd and emontx kit share so many of the same resistors and capacitors we could potentially offer a general openenergymonitor throughhole component kit with enough of the common components to build an emonglcd or several emontx kits. Then alongside the common component kit would be the PCB and emontx/emonglcd specific components such as the LCD, connectors and perhaps the atmega. We're' just working out the pricing for this. This could be quite a good option for people who have good home electronics stocks of different resistors/capacitors and could simplify the kitting for us with just one kit with 10x 20x of all the different resistors and capacitors. Interested in hearing people's thoughts on the idea.
This blog post is a repost from the forum thread here: http://openenergymonitor.org/emon/node/10802
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