Products > Test Equipment
Fluke 87IV please whisper in my IR :P
frenky:
So on this image:
Yellow is signal at D0(RX) and blue is signal on D7. So the image is showing encoding of serial data like here:
At D3 signal is HIGH most of the time. When photo transistor senses IR light the signal on D3 goes LOW:
serggio:
Thx,
Yes, It should be High level, because on Rx and Tx lines constant High always when no signal transmission (silent). Phototransistor probably work well for your application, because your solution use only 9,6 Bauds speed. Try to use fast speed photodiode and BC847 transistor for example. This will give you much better rise fronts for short pulses. Best phototransistors have couple-tens uS for rise up, while photodiodes have 5-100 nS
frenky:
Tnx. :-+
I have SFH203-FA photo diodes (with 5ns switching time) at home. https://goo.gl/j5ibUA
(I have bought many different IR transmitting diodes, detectors and transistors for this mini project...)
Can't wait to try it out to see the recovery time.
coromonadalix:
i'll try to implement your idea for a gossen metrahit 28s, it send data in hex or binary mode ???, i have the rs232 protocol infos
but i'm noob in arduino programming ...
asking 300$ usd for an interface ... if i can find it.
serggio:
--- Quote from: frenky on April 26, 2017, 07:00:14 am ---I have SFH203-FA photo diodes (with 5ns switching time) at home. https://goo.gl/j5ibUA
(I have bought many different IR transmitting diodes, detectors and transistors for this mini project...)
Can't wait to try it out to see the recovery time.
--- End quote ---
It should be are bomb! :-+ Osram photodiodes really cool! While I use 100 ns Vishay's T-1 package's photodiodes (17 uA photocurrent), fronts from them also seems very good even for 115,2K baud rate and maximum available amplitude for this speed.
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