Pages

▼

Saturday, 31 August 2013

emonTx V3 Progress Update

Since my last post introducing the emonTx V3  prototype design progress has been steady. The design has undergone several iterations and has now reached a stage of maturity.

The main features of the emonTx V3 have stayed the same:
  • ATmega328 Arduino IDE compatible microcontroller
  • RFM12B or Ciseco SRF 433/868/915Mhz RF wireless compatiable with RFM12Pi Raspberry Pi emoncms basestation
  • 3 x Standard (23kW max) CT channels
  • 1 x High sensitivity (4.5kW max) CT channel 
  • Integrated AC-DC power supply to enable powering the unit from a single 9V AC adapter while also sampling the AC voltage to calculate Real Power and AC Vrms readings 
  • Low power design with option to power from 3 x AA batteries for Apparent Power (current ony) measurement
  • Enclosed in wall mountable extruded aluminium enclosure
  • Terminal block connection for optical pulse sensor and DS18B20 temperature sensors
  • Pre-assembled SMT electronics
emonTx V3 with 3 x AA battery's and 1 x CT (Apparent Power setup)
Fully assembled with antenna in wall-mount enclosure

I am currently in the process of obtaining assembly quotes from manufactures as well as performing lots of testing.

emonTx V3.1 PCB Design 
emonTx V3.1 Schematic

The AC-DC circuit that was initially designed with the aid of simulation then bench tested is performing as expected.

Blue = output from 9V AC adapter Yellow = input to voltage regulator when unit is drawing 7.7mA  @ 3.3V, sudden dip is caused by RFM12B firing up to transmit four integer data packets (approx 24mA for 2.7ms)
If all goes well we're expecting to get the emonTx V3 into production in the next few of months.

at

8 comments:

  1. Anonymous1 September 2013 at 07:27

    Will they be available before the Christmas/New Year holidays for shipping to the United States? Perhaps mid-November? I've been holding off on setting up another emonTx for my parents until v3 was available. It'd make a nifty gift. :-)

    ReplyDelete
  2. Unknown1 September 2013 at 22:47

    An 7805 with an 5 Volt input of an USB-port?

    ReplyDelete
  3. Anonymous2 September 2013 at 02:55

    Congratulations! Looking very much forward buying some!

    ReplyDelete
  4. Glyn Hudson14 September 2013 at 02:42

    Hi guys, thanks for your kind comments. Sorry for the delay replying I don't seem to get comment emails from blogger.

    The MCP1702 footprint is not used. a SOT22 MCP1700 is used for USB 5V input and a SOT89 MCP1754 is used for AC-DC power supply circuit.

    The emonTx V3 should certainly be in shop before Christmas. I'm hoping before the end of October. Thanks for being patience, I know it's been a long time coming. Everything seems to take a longer than excepted in hardware development!

    ReplyDelete
  5. The Xim3 October 2013 at 00:13

    We are looking forward to get this new V3 ! Good luck guys for developping it ! :)

    ReplyDelete
  6. GaryP3 October 2013 at 05:53

    Same here looking forward to seeing the final version as this one looks good enough to pass the wife acceptance factor test - now to drop a few hints to the other half for a birthday present

    ReplyDelete
  7. Dave - M0IDD9 November 2013 at 05:16

    Is there any update on when it will hit the shop ?

    ReplyDelete
  8. Glyn Hudson5 December 2013 at 06:41

    In case you havent seen: it's in the shop now :-D http://openenergymonitor.blogspot.com/2013/11/new-hardware-is-in-shop-and-starting-to.html

    ReplyDelete

Note: only a member of this blog may post a comment.