Calculators with Support of the 82240 IR-Printer
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08-16-2014, 02:37 PM
(This post was last modified: 08-18-2014 08:29 AM by Martin Hepperle.)
Post: #41
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RE: Calculators with Support of the 82240 IR-Printer
(08-09-2014 11:22 AM)Marcus von Cube Wrote:(08-06-2014 08:15 AM)Martin Hepperle Wrote: Some Numbers Marcus, yes, you are right. You chose the golden middle of (6+8)/2. I saw that the HP 48 and 50 use 8 pulses, while my 28S varies between 6 and 7 pulses to get the average timing right (as per explanation from Christoph above) According to Christophs suggestions, I have now changed my code to measure the time interval between bursts relative to the average half-bit length (from the start bits) and now I can decode all IR signals that I have access to, from the HP 28S to the HP 50g. My conclusion so far is that the modern TSOP integrating decoders do not work for me and I have reverted to the C4103A Receiver unit which does no integration and just delivers the raw pulses. One could probabaly use any IR receiver composed of a IR Transistor and a simple amplifier. Now I can backup HP 28 programs on my PC and only need to build a key pusher device to reload the programs back... Martin |
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