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Messages - exapod

3
General discussion / Soft latching switch
Hi,
for a project i need to switch on and off a voltage supply (one cell lipo) using only one momentary push button.
i found this http://www.youtube.com/watch?v=Foc9R0dC2iI but the problem is that if the user presses the button for a long period of time the output oscillates.Can someone point an IC that does this or a discrete circuit.
4
Project logs / Re: wrist watch
Someone that knows how to use the rtcc of the pic can help me writing the code that fires an interrupt every 1 sec?
5
Project logs / Re: wrist watch
Two pics of the lcd working.I wrote the code for reading the button while the pic is in sleep.
Still fighting setting the RTCC to fire an interrupt every 1 sec.
6
Project logs / Re: wrist watch
That's a nice clock!
I have a working code for the lcd and i tried all the button and they work.
Now i'm fighting with the microchip library for the RTCC.
I was thinking of using the interrupt of the RTCC (every minute if i choose not to display the seconds)for wake up the pic and refresh the lcd.The pic can also exit the sleep state by pressing one of the button.
There is, until now, a problem with the design because i can't use the deep sleep of the pic because i don't have any button on the INT0 pin that is togheter with the RTCC interrupt the only way to wake up the pic so i can only go in normal sleep.
When i have a working code driven by only interrupt i will start the lcd design (clock font and various menus).
7
Project logs / Re: wrist watch
Here it is the board assembled.
I had to cut a part of the usb port because it was impossible to solder.
The rgb led works, i have only tried with the usb as the power supply because i don't have a one cell lipo.
Mouser only had the 96x96 display in stock that has a mirror finish so the light from behind is blocked... when i have a working code of the lcd i will remove the led that is just used as debug.
Now the part that i hate... programming.
I will post some update as i develop the code.
PS: what can i use to remove the flux residue?
8
Project logs / Re: wrist watch
Thanks for the suggestion if i do a second revision of the board i will include a voltage detector.
I'm a little busy this period, i will post some update at the end of september.
If the watch works at the end i will giveaway some boards because i have 12 of them...
9
Project logs / Re: wrist watch
Thanks for the help! for the voltage divider i can use bigger resistor, in the MOhm range for saving some power.
10
Project logs / Re: wrist watch
Regarding the lipo the answer is yes i will use a lipo with the protection circuit.
At this stage the only way to disconnect the lipo is by connecting the usb port for charging.
In power down mode the board should consume very little power but right now i'm not 100% of how much it is i will prefer to read it with some tools like the http://www.eevblog.com/projects/ucurrent/ that i don't have :D
11
Project logs / Re: wrist watch
All the resistor and capacitor are 0603, the pic is QFN-28 the charger is DFN and the LDO is SON.
i used this method for solder the 3 IC http://www.youtube.com/watch?v=d-f-SBC0GrU for the first time it seems good and the pickit read and program the pic without any problem.
And the pcb is two layer, very cheap from itead.
12
Project logs / Re: wrist watch
Photo of the first protoype with the parts that i have. I don't have a hot air gun or reflow oven so for the first prototypes i will not solder the accelerometer.
13
Project logs / Re: wrist watch
the boards have arrived, they look great, i'm waiting for the parts to arrive and then build the first prototype. I just realize that if use only two color for the back light leds i can use the spare I/O to drive an infrared leds and build a tv b gone function in the watch.
14
Project logs / Re: wrist watch
I'm using this buttons http://www.alps.com/products/WebObjects ... CE010.html .
Yes i saw it but i think that the buttons and the led backlight are a must in a wrist watch and also is very difficult to design the entire board in that way.
My clock is 0.75 (lcd) + 1mm (back light led) + 0.6mm(PCB)+1.2(tallest compenent on the board) + 4mm (battery 4mm is the max) = 7.55 mm , if i make the case 1mm thick that is 9.55 mm of total height(?).
Sorry for the bad english :D
15
Project logs / Re: wrist watch
The dimension of the pcb is 31x27 mm, a normal lipo with this dimension is 200 to 250 mAh, i have not made a lot of calculation at this point but the component don't draw much current..
For the backlight i have a 90 deg rgb led on the other side of the board on the top edge, i hope that it will be enough.
The particular lipo charger that i'm using doesn't have a fuel gauge.
I haven't think a lot about the case but i will try to 3d print it if i find a cheap company

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