Hardware design for 3.3V ProMini and 5v sensor
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@esawyja said in Hardware design for 3.3V ProMini and 5v sensor:
JSN-SR04T
Perhaps my memory is faulty, but I read somewhere of two types, and it was not a recent thread either. I was about to order some of these sensors, but will hold off doing so and watch for developments. Sorry, at least you have identified the problem, the question remains as to how the other version can be integrated.
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Hi all
Hope this will be of help to someone, I did connect the level convertor, did not make any change to the incorrect values, but then I saw that some off my JSN-SR04T are marked JSN-SR04T-2.0.
Eventually figured out that the JSN-SR04T-2.0 does not work with my design, there are some reports of other people not getting them to work either, see
http://forum.arduino.cc/index.php?topic=474759.0 , but no resolve.
So the circuit design above seems to be fine, except that it does not work with the JSN-SR04T-2.0,
The only differences I can see are the following
JSN-SR04T-2.0 - Crystal at 8,000 and the chip marked 7B499, 8S003F3P6, PHL703
JSN-SR04T - Crystal at 11,0592 but no markings on the chips
See some comparison pictures below
and the markings
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@esawyja in the top photo, what is the component in the top left hand side? Is it a variable resistor??
@Denverado I think it is for the beam width, not to sure, I've never adjusted them
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This post is deleted!
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@esawyja in the top photo, what is the component in the top left hand side? Is it a variable resistor??
@Denverado It is a variable inductor
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Well it does make sense what you said, yes I'll be making sure that I order the correct one as well, very expensive exercise as I have 12 x JSN-SR04T-2.0 that I will not be able to use..
Thanks for all the help@esawyja FYI - As I posted on a separate thread, there was a comment against the type 2.0 on one supplier's site which read "Note: Version 2.0 requires echo pin to be pulled up to VCC. A 4.7K to 10K resistor can be used as pull-up resistor." I tried the 5v supply of the ultrasonic board, I tried Vcc from the Pro-mini and 3.3v from the board, I tried every delay, exhausted every variable possible as far as sketches went but still could not get this device to work..... Waiting on delivery of a DYP device to see if it resolves the problem, if it does, I will throw this particular board in file 13 and order another DYP....
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@Denverado It is a variable inductor
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@zboblamont Thanks! What is it used for on the sensor?
@Denverado If you mean the variable inductor, I don't know in this specific case...
They are normally used in conjunction with other components to adjust frequency to target, my guess would be to tweak the ultrasonic frequency to keep it within specification (40kHz?), but perhaps someone can advise who has investigated these devices in detail.
I would not advise tinkering with it unless you know the circuit and have the means to determine the effect. -
@Denverado If you mean the variable inductor, I don't know in this specific case...
They are normally used in conjunction with other components to adjust frequency to target, my guess would be to tweak the ultrasonic frequency to keep it within specification (40kHz?), but perhaps someone can advise who has investigated these devices in detail.
I would not advise tinkering with it unless you know the circuit and have the means to determine the effect.@zboblamont Thanks for the advice. I have been looking for a circuit diagram of the sensor to determine how adjusting it could change the beam. I would love if the beam was not as wide.
