Archived Forum

Hi John,

1. Apologies regarding the resistor. If you drop me an email with you address I will get one in the post. The 10K resistor (R1) is used to pull-up the reset line on the Atmega. Without it you might have issues with the Atmega randomly resetting or not autoresetting properly upon code upload. 

2. Yeah sure, it's possible to use other AC-AC adapters. See 'detailed circuit design' of the AC Mains Non-invasive V3.0 for instructions on calculating component values http://openenergymonitor.org/emon/input.

The schematics for the emonTx are up on solderpad: http://solderpad.com/openenergymon/emontx/

Let us know how you get on. All the best, Glyn. 

Hi Glyn,

That's no problem, I can just get it near where I live. I'll let you know how it goes.

Thank you.

cheers,

John

Hi, I have just finished soldering the emontx, but when I tried to connect the usb power to the board, the green light did not light up. FYI, I'm only soldering ct1 and ct3 together with the corresponding components for it (I did not solder the resistor for ct2) Do I need to solder all parts in order for the board to turn on? Also is there anyway to check using multimeter so I can trace if I made a mistake in soldering the components (just like the nanode where we could check on the voltage using the IC pin) Thanks. kind regards, John

do you have uploaded the sketch ?

Hi,

I haven't uploaded the sketch yet, I reckon when I connect the usb cable to power the board, the green led should light up, yes ?

Thanks,
John

Hi

solved the problem, turns out that i have to uplod the sketch first. and the led is not an indicator whether the board is on of not rather than it's used when there is data transfer example if you upload the sketch to the board it will flash.

thanks.

regards,

John