From HP 41 to WP 34 S
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02-08-2015, 02:41 AM
(This post was last modified: 02-08-2015 02:48 AM by BarryMead.)
Post: #7
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RE: From HP 41 to WP 34 S
(02-08-2015 02:24 AM)garfy Wrote: thank you, interesting, i wonder if i am able to add this micro usb.I have modified calculators using BOTH the micro-USB board method, and the 2.5mm headphone jack method and I find that the 2.5mm headphone jack method is much easier. The cable is a standard FTDI USB to 3.5mm 3.3v headphone jack cable here with a standard 3.5mm female to 2.5mm male adapter here on the end of it and you only need to solder three wires. With the Micro-USB board you need to solder at least 5 wires and remove two surface mount inductors. Also the holes you cut into the case of your calculator are simpler with the 2.5mm headphone jack method all you need is a small round jeweler's rat-tale file. Take Care, Barry |
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