May 23, 2012
How far or close do you need to be from the source to work?
about 3 years ago
I built the board and the LED flashes periodically. I connected the board to my computer with an FTDI cable (it is just a usb-to-rs232 interface cable). By using an RS232 communication program (PuTTY) I am getting the “OK” on the terminal. I don’t see the Sparkfun logo on the LCD and the board offers no functionality. I believe this is how it is shipped.
I have no idea how to download any of the programs provided above (I have been using AVR’s and I have no experience with PICs and I don’t have a PIC programmer).
So, can somebody tell me how to download the “Revised Code” shown above using the bootloader, if this is possible. Ryan Kit says in his tutorial that the bootloader provided by Sparkfun can handle files up to 2K. The tutorial dates back to 2008, and I hope this is not accurate, because I would have to find a PIC programmer which I would like to avoid.
A few thinks I tried are:
1) I download the Windows XP Hyperterminal, and I tried to use the option to send a file to the RS232, but that didn’t work.
2) I found this bootloader http://www.etc.ugal.ro/cchiculita/software/picbootloader.htm and program. Of course, I have no programmer to download the bootloader program provided on the website. I get the OK’s on the “Terminal” tab, but the program doesn’t recognize the device, and it cannot program it. I believe this is because it needs the corresponding bootloader that can communicate with this program.
3) I downloaded and installed MPLAB IDE v8.85. I see that there are several programmers supported, but I couldn’t find an option to download a program on a PIC using RS232 though a bootloader.
1) Can somebody tell me what software I need on my Windows 7 computer to load a hex on the PIC by using RS232 and the booloader that is on the PIC?
2) Is there some sequence of things I need to do to download a hex on the PIC (such as press reset, or power up the device while having reset pressed and then send the file, etc)?
Thanks a lot!
Tutorial - SMD How To - 2
about 3 years ago
I have on my board a 100-pin connector with 0.5mm pitch. I see how the technique works above. In my case, I will order a Kapton stencil for the whole board, including the 0.5mm connector, and I will reflow it. I am worried that I will have trouble reflowing the connector. I followed the manufacturer’s recommendations regarding the pcb layout and paste mask (you can see those on page 9: http://pewa.panasonic.com/assets/pcsd/catalog/p5k-catalog.pdf). However, the stencil manufacturer told me that it will be difficult to avoid bridging with this small pitch. Instead, he recommended to replace the paste mask (i.e. 100 cuts for each of the pads) with two thin lines perpendicular to the pads, one on each side of the connector. The idea is to reflow it and then rely on the surface tension to do its trick.
I am not sure what to follow. Has anybody any experience on reflowing 0.5mm connectors, and any opinion whether I should try the connector’s manufacturer recommendation or the alternative suggested by the stencil manufacturer.
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