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When you say displays, you mean the ones that are in stores like walmart usually by the cash registers?
I'm kind of skeptical how they can intensify the light... I guess multiple reflectors?
Right... but do they have more then one LED as the light source. Seems too uniform for it to be only one, unless it was in thte center, but thats where the cord or plug is. ( i forget if that ring is on the power brick connector, or inside the laptop itself.)
I was looking around for photos of how they implemented they did that charge ring on the powerbooks.
I was curious how they were able to get such uniform light around the ring.
Anyone know or know of a link to a site with dismantled pictures of that subsystem?
Its unclear whether it's driving it out of it's specs. It says it can sink.. it can source so it's sinking/sourcing it maximum amount. I dunno enough about the internals of a uC to say what limits this.
Current per segment isn't bright enough and the display is only used for 10 seconds at...
I prototyped a circuit which uses a pic16lf628A uC to drive an alphanumeric LED display.
The PIC uC can't source/sink the amount of current to light up more then like 4 segments at full brightness.
Two questions...
1) Does it damage the uC to attempt to drive more current then it is...
yeah i found it kind of rediculous that the datasheet didn't have any information about how this display was supposed to be used.
Trying to find images of how each character should look is pretty hard to find. What i mean is some type of reference for what an A, B, C... etc looks like cause...
I bought some Alphanumeric LED displays which only have 7 data lines and 4 mux. They have less i/o lines then typical alphanumeric led displays.
https://www.electro-tech-online.com/custompdfs/2004/10/MDA6141C6341C6441C6941C.pdf
If you look at page 3 on the datasheet above it shows you the...
Thanks for your detailed response Exo. I've looked into your suggestions and i'm going to go with the PIC16LF628A. One thing that's really neat about the PIC Chips with nanoWatt technology is they have an option to specify an internal clock of either 4Mhz or 37Khz by setting a bit in the PCON...
If you have a voltage of 2.1V and the forward voltage drop across the LED is 2.1V. Then don't you not need a current limiting resistor? Since the voltage across the loop is already 0. The LEDs aren't very bright as is so there isn't that much current going through the LEDs. Is it possible...
I'm made a simple circuit which i use to store the floor and section i parked my car in. It's a small circuit board which goes on my keychain that has two 7-segment LEDs, a pic uC and a 3V coin battery.
Since our Vdd is about 2.2V after the voltage drop from the SCR. The SCR is used to turn...
it looks like they have single row connectors but the connector still overlaps the pcb on both sides to sandwich the pcb inside the connector.
Am i wrong?
I have a Pharos i360 GPS receiver. As you can see from the photo there are two parts. One is a gps receiver and the other is a serial to cf converter.
I'd like to insert a small circuit in between these two modules. Therefore, i need to find mating connectors.
Find connectors is hard...
have a circuit that has a serial data stream output. I'd like to use the Compact Flash port on my pocket pc as a serial port thus allowing my device to communicate with the pocket pc through a com port.
An easy solution would be to get a compact flash to rs232 card and then just hook a cable...
I have three chips which could run off a 13Mhz clock.
At least two of the three can be driven by a reference frequency. Meaning they don't have to drive a crystal they can be hooked up to an oscillation directly.
I could use one chip to drive the crystal and then i was thinking i...
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