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Re: how can I use MSP430 to output 16-channel square pulse ?

 by ceibawx ¦  Thu Sep 16, 2010 6:45 pm ¦  Forum: MSP Microcontrollers ¦  Topic: how can I use MSP430 to output 16-channel square pulse ? ¦  Replies: 2 ¦  Views: 1232

I need a bipolar square current, the frequency and amplitude is adjustable.
Now single square current is enough, and it can be processed further after then by a special circuit.

leon_heller wrote:What do you by bipolar? Frequency?

how can I use MSP430 to output 16-channel square pulse ?

 by ceibawx ¦  Thu Sep 16, 2010 6:41 am ¦  Forum: MSP Microcontrollers ¦  Topic: how can I use MSP430 to output 16-channel square pulse ? ¦  Replies: 2 ¦  Views: 1232

I haven't use MSP430 before. Now I need output 16-channel bipolar square current. Is it possilbe?
I know that FPGA can do it. But I have no idea about MSP430.
DEAR friend, can you analyze it for me? And recommend somethingļ¼

 by ceibawx ¦  Fri Feb 27, 2009 11:27 am ¦  Forum: Wireless/RF ¦  Topic: PIC to XBEE Help ¦  Replies: 10 ¦  Views: 2614

Hi the first, if you send 0x00 in TX XBEE, you should receive a 0x00 in RX XBEE. Second, in PIC uart there is a SPBRG register, you can change the value to set different buad of uart port. third,if you only send a couple of bytes, you need not use delay. But delay is necessary if you send a continuo...

 by ceibawx ¦  Fri Feb 27, 2009 11:09 am ¦  Forum: Wireless/RF ¦  Topic: xbee communication in broadcast mode. ¦  Replies: 5 ¦  Views: 1478

You are welcome. and I like your true words, and your care.
Ok. PIC is 5V, so inverter is used twice before the pic output is sent to xbee.

 by ceibawx ¦  Fri Feb 27, 2009 9:08 am ¦  Forum: Wireless/RF ¦  Topic: xbee communication in broadcast mode. ¦  Replies: 5 ¦  Views: 1478

Thanks. I appreciate your help. :)

 by ceibawx ¦  Fri Feb 27, 2009 8:35 am ¦  Forum: Wireless/RF ¦  Topic: XBEE received data from tx xbee with a data source from PIC. ¦  Replies: 3 ¦  Views: 1188

yes. you are right. I used CTS judge in PIC code.
And it did work.But now it does not in pcb board.

 by ceibawx ¦  Fri Feb 27, 2009 8:34 am ¦  Forum: Wireless/RF ¦  Topic: xbee data is lost ¦  Replies: 9 ¦  Views: 2334

Finally I found some reasons.
Firmware should be 10CD. I downloaded it. Then it did work.
But now on pcb board, the RX XBEE doesn't talk to TX XBEE.
Any body can help me?

xbee communication in broadcast mode.

 by ceibawx ¦  Fri Feb 27, 2009 8:16 am ¦  Forum: Wireless/RF ¦  Topic: xbee communication in broadcast mode. ¦  Replies: 5 ¦  Views: 1478

I met problem in two xbees communication. The system does consist of two xbee802.15.4, ADC and one pic16f628a. The pic acquired some data from ADC, then send them to TX XBEE. RX XBEE will receive them, I can see these data on the X-CTU. it did work in breadboard testing. so I solered all the chips o...

Re: Xbee 2.5 Problem Delayed Data recive on the End device

 by ceibawx ¦  Fri Feb 27, 2009 8:13 am ¦  Forum: Wireless/RF ¦  Topic: Xbee 2.5 Problem Delayed Data recive on the End device ¦  Replies: 6 ¦  Views: 2665

It is interesting.
One question. how did you watch the data from usb interface board to your breadboard?
You use a probe of oscillscope to see?

 by ceibawx ¦  Fri Feb 27, 2009 7:58 am ¦  Forum: Wireless/RF ¦  Topic: Xbee Voltage Tolernace ¦  Replies: 6 ¦  Views: 1608

No. it is dangerous. a guy input 5 voltage signal, so the xbee is blow.

 by ceibawx ¦  Fri Feb 27, 2009 7:57 am ¦  Forum: Wireless/RF ¦  Topic: XBee 802.15.4 - Communication lost if more than 1 meter ¦  Replies: 4 ¦  Views: 1262

How is your board?
I found one problem.
I think that two xbee doesn't talk. because they can not find each other. this should be done by DH,DL,MY. but you didn't set it.
Only my thought, how about you?

 by ceibawx ¦  Fri Feb 27, 2009 7:53 am ¦  Forum: Wireless/RF ¦  Topic: PIC to XBEE Help ¦  Replies: 10 ¦  Views: 2614

I did, and now I am still compiling pic and xbee. first on xbee, I used VCC,GND,DIN,CTS pins. Second about communicate mode, I chose broadcast mode. because in the other mode-----unicast mode, rx xbee will send a ACK to tx xbee, while my tx xbee is sending data continuously. I used 57600baud. Delay ...

Re: XBEE received data from tx xbee with a data source from

 by ceibawx ¦  Mon Jan 05, 2009 12:14 pm ¦  Forum: Wireless/RF ¦  Topic: XBEE received data from tx xbee with a data source from PIC. ¦  Replies: 3 ¦  Views: 1188

Now I use 2 xbees with 2 X-CTU. I transmit 200 0F followed by 4 "0A0B0C0D0E0F",so the total is 224bytes. Finally I received 100bytes 0F without the latter, sometimes it is only 4 "0A0B0C0D0E0F" without 0F. Sometimes they are some 0F followed by 4 "0A0B0C0D0E0F". and I used broadcast mode. The reason...

XBEE received data from tx xbee with a data source from PIC.

 by ceibawx ¦  Mon Jan 05, 2009 11:52 am ¦  Forum: Wireless/RF ¦  Topic: XBEE received data from tx xbee with a data source from PIC. ¦  Replies: 3 ¦  Views: 1188

Hi , I met problem. I send 0x0F for 200 times first, Then send core data. But in RX XBEE, I didn't receive 200 0x0F. Sometime 0F is received , sometimes it is not 0F but E8. Sometime the total number is 90, sometime it is around 140. Who can help me? What's the probable reason? In Xbee? Maybe 200 by...

 by ceibawx ¦  Mon Jan 05, 2009 6:58 am ¦  Forum: Wireless/RF ¦  Topic: rx xbee data always shifts in the middle of whole rx data ¦  Replies: 6 ¦  Views: 1964

Ask:
1. 115200 can not be used.?
2. 57.6k can not transmit 56k bitstream?