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Re: Implementing RS232/UART with GPIOs on ADUC702X ARM uC

 by monstrum ¦  Sat Sep 10, 2011 4:39 am ¦  Forum: Everything ARM and LPC ¦  Topic: Implementing RS232/UART with GPIOs on ADUC702X ARM uC ¦  Replies: 2 ¦  Views: 1201

Just do a Google-search for "software uart".
This one from IAR is very simple. All you need is a timer. http://supp.iar.com/Support/?note=88469

Re: Eagle: ground planes

 by monstrum ¦  Fri Sep 02, 2011 3:52 pm ¦  Forum: PCB Design Questions ¦  Topic: Eagle: ground planes ¦  Replies: 1 ¦  Views: 3978

You can't rename signals by going through the info-window. You must use the name command. I think the symbol has "R2" written on it.

Re: Routing ground loop to bottom layer

 by monstrum ¦  Sun Aug 14, 2011 2:51 pm ¦  Forum: PCB Design Questions ¦  Topic: Routing ground loop to bottom layer ¦  Replies: 5 ¦  Views: 1017

Not necessary to run any CAM job. The RATSNEST command will fill out all polygons exactly as they will appear in gerber output.

Re: CAN-BUS Shield: Extended CAN Messaging

 by monstrum ¦  Sat Aug 13, 2011 12:01 pm ¦  Forum: SparkFun Product Questions ¦  Topic: CAN-BUS Shield: Extended CAN Messaging ¦  Replies: 11 ¦  Views: 2403

Maybe I'm missing something but after reading your post twice I still can't figure out what the problem is.

LPC1768, VREFN not connected to ground!?

 by monstrum ¦  Thu Aug 11, 2011 2:02 pm ¦  Forum: Everything ARM and LPC ¦  Topic: LPC1768, VREFN not connected to ground!? ¦  Replies: 1 ¦  Views: 761

I missed spotting an error before sending my boards out to fab. Both VREF terminals got tied to +3.3V. First chip I tried induced a short from +3.3V to ground. I thought it just had got killed as I had to heat up the board three times to replace a voltage regulator. That or perhaps ESD. The second c...

Re: SparkFun's Polymer Lithium Ion Battery - 6Ah disassembling.

 by monstrum ¦  Sat Jul 30, 2011 4:22 pm ¦  Forum: SparkFun Product Questions ¦  Topic: SparkFun's Polymer Lithium Ion Battery - 6Ah disassembling. ¦  Replies: 6 ¦  Views: 997

Probably possible. Just be aware that the cells are probably connected using strips of aluminum which need special solder.

Re: Where to make a Multi Project PCB?

 by monstrum ¦  Sat Jul 30, 2011 4:19 pm ¦  Forum: PCB Design Questions ¦  Topic: Where to make a Multi Project PCB? ¦  Replies: 10 ¦  Views: 1835

So how do they define a project? If the ground plane for all boards are connected, is the whole panel a single project?

Re: Accessing magnetometer for 9DoF stick

 by monstrum ¦  Sat Jul 30, 2011 12:21 am ¦  Forum: SparkFun Product Questions ¦  Topic: Accessing magnetometer for 9DoF stick ¦  Replies: 2 ¦  Views: 435

Not sure if something is wrong with your hardware or software. But what really blow my mind when I first started playing with magnetometers was that earths magnetic field up here in the north is far from parallel with the ground. It is rather almost perpendicular to the ground. You should calculate ...

Re: Where to make a Multi Project PCB?

 by monstrum ¦  Fri Jul 29, 2011 11:45 pm ¦  Forum: PCB Design Questions ¦  Topic: Where to make a Multi Project PCB? ¦  Replies: 10 ¦  Views: 1835

Sounds ridiculous that they limit the number of designs. You could always connect the different boards with on or two wires, then the whole board would in fact be one project/design.

Re: Processing

 by monstrum ¦  Tue Jul 26, 2011 4:10 am ¦  Forum: BatchPCB ¦  Topic: Processing ¦  Replies: 9 ¦  Views: 2583

I guess they have a deal that allows orders to stack up and be worked off when there are gaps in the usual production.

Re: Eagle LPC1758 (TQFP80) part from the lpc1xxx-v6 library

 by monstrum ¦  Tue Jul 26, 2011 4:00 am ¦  Forum: PCB Design Questions ¦  Topic: Eagle LPC1758 (TQFP80) part from the lpc1xxx-v6 library ¦  Replies: 3 ¦  Views: 909

In worst case, you could make the pads narrower than the actual device pins to pass a given a set of design rules. I have done it many times both hand soldered and in heat oven.

Re: Can you do castellated pads with BatchPCB

 by monstrum ¦  Fri Jul 22, 2011 5:46 pm ¦  Forum: BatchPCB ¦  Topic: Can you do castellated pads with BatchPCB ¦  Replies: 4 ¦  Views: 2030

They are commonly called gold fingers and they usually cost extra. One way to do it without any special process: If they allow you to place a via/pad right on the edge of the board it should get plated as the outer cut is made at the very last. If they do not allow you to place holes outside the boa...

Re: Is my BatchPCB board soldermask wrong?

 by monstrum ¦  Tue Jul 19, 2011 8:01 pm ¦  Forum: BatchPCB ¦  Topic: Is my BatchPCB board soldermask wrong? ¦  Replies: 2 ¦  Views: 1171

You actually draw the stopmask, which is where the soldermask will not be applied.

Re: Autopilot system design choices

 by monstrum ¦  Mon Jun 20, 2011 9:28 am ¦  Forum: SparkFun Product Questions ¦  Topic: Autopilot system design choices ¦  Replies: 7 ¦  Views: 883

That K60 looks very interesting. Seem to have IAR and FreeRTOS support "out of the box" also, perfect! Too bad the available non-BGA versions don't have FPU. Should still increase performance a lot over M3 with the cache and DSP-instructions.

Re: Autopilot system design choices

 by monstrum ¦  Sun Jun 19, 2011 3:24 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Autopilot system design choices ¦  Replies: 7 ¦  Views: 883

How about one of these $90 FriendlyARM Mini2440 405 MHz ARM9 boards? Image # CPU: 405 MHz (533Mhz max.) Samsung S3C2440A ARM920T # RAM: 64 MB SDRAM, 32 bit Bus # Flash: 128-1024 MB NAND Flash and 2 MB NOR Flash with BIOS # EEPROM: 1024 Byte (I2C) # Ext. Memory: SD-Card socket # Serial Ports: 1x DB9...

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