HiMARK RX datasheet, UHF ASK Receiver (1-page), RX datasheet, RX pdf, RX datasheet pdf, RX pinouts. The RXA is a fully integrated, amplitude-shift-keying. (ASK) modulation HiMARK. RXA-LF. RXA. 20 Pins, SSOP, mil. HiMARK. RXA- LF. HiMARK RXA-LF datasheet, cross reference, circuit and application notes in pdf format.
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Dataseet 1 of 2 1 2 Last Jump to page: Results 1 to 40 of Join Date Mar Posts I try to change the baud rate but nothing happens. Actually I want to send a character using my RF module. But before I accomplish that, I want to test my RF module whether it’s function or not. So I use this simple program to test it but my LCD at the receiver board display nothing. I don’t know how to troubleshoot the problem because Bimark new to this thing.
RX3310 Datasheet PDF
Please help me guys. Here is the code and the schematic of my hardware. Join Date Sep Location montreal, canada Posts 6, I will suggest you to test it without the RF modules for now. Once you have something workable, just add the modules. Make sure the PIC config fuses are correctly set. Steve Datsaheet not a bug, it’s a random feature. There’s no problem, only learning opportunities. What PIC dataeheet you using? Does it have an ADC that needs disabled?
When testing the com link with wires, do not forget to also connect the ground between both circuits.
Dave Always wear safety glasses while programming. See pics in POST 1. Once the wire connection will work, i may suspect 2 other things.
RXA – HIMARK – IC Chips – Kynix Semiconductor
And in the schematic pin 3 of the LCD goes straight to ground. No pot for contrast. I know on some modules this works, but are you sure it is this time. Join Date Dec Posts 1, Join Date Aug Location Look, behind you.
Is this all of it? I do not see anything to cause the transmitter to send data from the keypad, unless I have become legally blind. I see empty variables in the serout routine.
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There simply is no “Happy Spam” If you do it you will disappear from this forum. Joe, seems you missed the underlined section Maybe Joe has bifocals like me. Originally Posted by dhouston. Originally Posted by Joe S. Hi, try a direct connection porta to porta with following. Originally Posted by mackrackit. Hook a pot up as a voltage divider with the wiper going to display pin 3.
Then adjust until the black boxes go away. There’s a long long long way in between, i think you could try the Inverted mode first and then slow the baudrate, say bauds. You should have a decent distance between the transmitter and receiver Nowi don’t know the RF receiver you have, but it’s possible that it’s output is an open-collector type.
I would suggest you to add a 10K pull-up resistor between Vcc and RA. Same thing for your PICs. You can also try to add more Synk character at the begining of your transmission. Begin with it and see what happen. Without any spec of your module, it’s a bit hard. I’ll also suggest you to follow Dave’s post http: Probably the internal comparator could be used here. Seems to be the one you’re using right? It says the output come with noise and it seems like the main problem.
Is there any chance for the receiver to get the sending data clearly without noise If I connect the data pin to LM ? OK, i’ll start a new thread later about how using the internal comparators. Do you have any oscilloscope? In meantime you could do some test with an external comparator The dataslicer uses a comparator as I explain at http: Adding another comparator might be useful for educational purposes but is of little practical value IMO.
In this case, the only output from the receiver is digital so the noise pulses will have the same amplitude as the data and the duration of the noise pulses are likely to be nearly the same as the bit period.
What kind of comparator circuit are you planning? It is far simpler to use a relatively wide sync pulse followed by the data. The receiver can look for the sync pulse and only after receiving it, look for the data.
The data can use almost any protocol desired, including RS with or without manchester coding. I also recommend sending 3 or more copies of each packet, including the wide sync pulse. Check your comp drawing.
If it’s correct, you’re sending the comp to rails. I think you ment to take the output of the rec to the inverting input, not ground.
The uf cap is a bit much. I’d use a 1uf or even a. Also, what’s the signal look like at 1. Your receiving scope pix says you’r reading at If your data is riding on the noise at 1.
There’s a load of noise indeed Maybe the following link will help you a little bit http: I’m really in between few things I have tested a SAW controlled transmitter and superregenerative receiver from the same company. There is not much you can do with a comparator to reduce the noise. Your best bet is to use the techniques I’ve recommended repeatedly. Furthermore, if you look at the block diagram in the datasheet from the HiMark RXA chip, you will see the comparator in the output circuit.
Adding another will not help. Join Date Jul Posts 2, Wow that really is some sloppy output stage. I’m curious is this data-slicer is ever squaring anything.
Regards, -Bruce tech at rentron. Thanks for all the advice Now my Rx module works fine in a short distance around feet. I just add 10k pull up resistor at Rx data pin and 10uF at Vcc. But It’s fine to me. At least it’s work. I think maybe the problem is from the antenna. I just use a small wire with length 10cm each for my Tx an Rx. So anyone here have any ideas about the antenna?? Now I’m moving foward to send a data from my keypad. IF I pressed pad1,pad2 and so on.
I wrote the code below. But It’s not work even I Connect the transmitter and receiver pin directly. I’m very poor with the coding. Pause 50 ‘ Debounce getkeyu: Try those with direct connection.