See a quick drawing attached.

As soon as you energise one of the relays it will switch that load on, but it also breaks the circuit for the other relay, meaning you can't energise it.

Whichever relay is switched first will switch it;s load and prevent the other from being used. When you release that relay you can then energise the other one.

There is no way you can energise both relays at once.

Get a relay with contacts rated for the voltage you want to switch. That's what a specification is for.

I don't know what the supply tolerances are in US, with Osgeld saying he's seen 110v one day and 130v the next, but here in the UK the stautory limits are 230V +10%/-6% giving a legal variation of 216.2V to 253V.

It used to be 240V +/-6% so similar limits at 120V would allow 112.8V to 132V, so it's quite possible depending on time of day and load factors.

You'd still just get a relay rated at 120VAC though.

Why not just de-solder the ribbon cable and solder your own wires on? Might be easier.

Is it a 2 line display? The '162' in the 'P16245B-C R3' code *could* signify 16x2. It's a wild guess as there's no image of the front.

I've been playing around with many ideas to get a nice finish for mounting 16x2 LCD displays to my project.

I finally settled on a nice easy and low cost way to get a finish I'm happy with.

Whilst making the last batch I took some detailed photo's and I've now made an Instructable to show the process.

I thought it might be of some use to others here, as it can be easily adapted to any size display.

I hope it's OK to post this here for the benefit of anyone else.

http://www.instructables.com/id/Home-Made-Bezel-Window-for-LCD-LED-Displays/

Looking at prices it seems most places sell the 1284 cheaper than the 644 anyway.

Whatever you get you'll need to set the fuses as a minimum. For this you'll need an ISP programmer or another Arduino to use as an ISP.

The easiest way would be to burn the 644 or 1284 bootloader and then use a USB > UART converter to continue uploading via USB. You could upload sketches directly using ISP as well.

If using Arduino IDE the you'll need to add some entries to the boards.txt file and also some pin definitions.

The 644 and 1284 optiboot bootloaders can be done using IDE with either an external ISP or an Arduino as ISP.

I'm now using Nick Gammons programmer sketch to bootloader 1284's but it doesn't have 644 capability at the moment so that has to be done via ArduinoISP. I'm going to go back and see if I can work out how to add 644 to Nicks sketch.

I'm now using 1284 on my own board design for my project. This includes onboard ports for directly plugging in nRF radio modules, SD card, Ethernet, Bluetooth, GPS, accelerometer, matrix keypad, custom buttons, digital audio amplifier, RGB LED strip, shift register control, dual power input with 3 voltage monitor circuits and multiple I2C device headers. My v2 design includes RTC connectors, RFID and the ability to use a 328 with limited peripherals where minimum functionality is required.

I'm finding the 1284 to be a great coding workspace after the 328. I have some 644's that I need to try boot loading and testing on my board.

Yes, the site works fine. I've got two more orders that should be arriving in the next few days. The communication from Elecrow during your whole order process is excellent.

Have you tried with a different SD card?

I have some SD cards that just won't initialise in my card reader. I have two cards exactly the same,  2gb and same make and model, and only one will work with the reader. Both work in the pc. I also have some microSD that won't work either, where others do.

I have selected this mosfet for power protection:

http://nl.farnell.com/fairchild-semiconductor/rfd14n05l/mosfet-n-logic-i-pak/dp/1017789

Hardly any resistance, can go up to 14 Amps, switches at about 2 - 3 V, so even with 3.3 V you can switch it open. If any of you see any reason not to pick this one I'm much obliged to hear. I still have a fair share of these so if they are good enough, I'll use them.

That's an N-Channel by the look of it. You need a P-Channel.

I use MIC39100 VR. 1A rated and 410mV drop out.

I've just installed the beta on my phone. I'll have a play with it and provide feedback.

1) if you configure the screen and commands from the uC then do you have to do this every time? I.e settings lost and each connected device configures the connected BTInterface screens?

2) Is any particular version of Android required? I'd like to install in a cheap phone with PAYG SIM to provide mobile remote interface with the SMD ability.

It looks promisimg with some feedback to mature. :-)

Thanks

If you have input another companies Vat number in order to attempt to pay exclusive of Vat then you are commiting Vat fraud!

There is an option to leave comments at checkout. I'm sure you could leave a note to ask them to ship as not requiring signature, due to it being difficult for you due to working hours.

I like the signature touch as it shows they are serious about making sure your items reach you. If there is no signature then there is also no proof where an item may have gone missing in the delivery chain.

Anyway, I've now built the first board and tested it as working well. There are a couple of minor errors on my part, but nothing serious enough to prevent use.

Here's a couple of photo's below. I've also just submitted another 2 orders and will be following with some more in the next day or two. So far I can't recommend them highly enough. They tick all the boxes; Price, Options, Quality, Service, Delivery.

Boards from Elecrow just collected from the Post Office. They were sent as signature required, which is another nice touch on top of the emailed photo's and tracking.

I've only had a chance to look at one quickly but the quality looks very good.

I need to get some components soldered in the next few days and test these properly to make sure I've made no mistakes. I'll then report back.

Order placed 29th January. Order received in UK 13th February. Two weeks from order to delivery. :-)

Yes, factory default is 8Mhz internal osc and Clock Div 8 to give 1Mhz.

After seeing this I thought I'd email Sitopway for a quote.

Just received it and they quoted me 50USD for 10pcs 100mm x 100mm dual layer, red soldermask, top/bottom silkscreen on 16mm FR4.

That's 20USD more than Elecrow, so looks like I'll be sticking with them.

The OP said 5.2GBP for 130mm x 140mm, so I wonder if that was just per single PCB, ie 10 pcs was 52GBP? That would make more sense at about 80-90USD for 10 pcs 130mm x 140mm, based on what they have quoted me.

If you're struggling to locate a particular library used in a specific project then it may be more productive to contact the author of that project for support.

Hopefully they can tell you where to get the library. It may be one of their own for that particular sketch.