Comments on: Playing Xbee. Part 3 – Measure and send.

By: oleg

oleg — Mon, 21 Nov 2011 00:26:00 +0000

I’m not familiar with Xbee internals, sorry. If USART works, why don’t you just use it?

By: voland

voland — Sun, 20 Nov 2011 19:02:45 +0000

Hi, Oleg!
These commands are supported every time, there’s no any info in datasheet which points to some contitions. I tried to communicate via USART and XBee in End Device mode started to work normally . I saw that SPI interface connected to both modules – RF and controller inside XBee with the same CS signal. So, it’s possible that these parts use SPI to communicate while I try to send packets to them :/. But there is no any information about this in datasheet .
Thanks for your answer

By: oleg

oleg — Fri, 18 Nov 2011 20:50:03 +0000

Check the doc to see if these commands are indeed supported in end-device mode.

By: voland

voland — Fri, 18 Nov 2011 08:47:20 +0000

Hi, Oleg! Thanks for supporting such interesting site! I have question about XBee.
There is AVR controller connected via SPI to Xbee. It performs SPI-master for XBee and uses API-mode operation to send some packets. Packets use commands of type 0×90 which could send data to remote modules. All’s working fine untill XBee works in Router mode. When I tried to switch it in the End-device mode (when it periodically sleeps) but such system doesn’t work at all . Module doesn’t send packets to remote, as it was in Router mode. What could advise in such situation?
PS: now i’m triyng to connect AVR to XBee with USART. It was one probe to do so (I connected it to Cortex M3), but module still not worked .

By: oleg

oleg — Mon, 04 Jul 2011 17:00:37 +0000

How did you come up with 5 – for me, it’s closer to 10.

By: Robert

Robert — Mon, 04 Jul 2011 07:06:42 +0000

Hi, I just have one little remark about something you said in this post. You said that “The manual recommends bypassing VDD using 1uF and 8.2pF caps in parallel; I’m using 0.1uF here and it works well also.” I calculated that you are using aprrox. 5 times less capacitance than what the manual recommends, and that, I thought was just astonishing to find out.

By: Eric S

Eric S — Wed, 02 Mar 2011 00:21:38 +0000

My Remote Xbee does not respond when I do the following:

int OutputPacketLength = 9; // SB 9?

XBee_Data[0] = 0x7E; // Start Delimiter
XBee_Data[1] = 0×00; // Length Msb
XBee_Data[2] = 0×05; // Length Lsb
XBee_Data[3] = 0×08; // API Frame Type
XBee_Data[4] = 0x4D; // Frame ID, any non-zero Value
XBee_Data[5] = 0×44; // First Byte “D” AT Command (D0) Digital Output Zero?
XBee_Data[6] = 0×30; // Second Byte “0″ AT Command (D0)
XBee_Data[7] = 0×05; // Pin High Output
XBee_Data[8] = 0×31; // Checksum
XBee_Data[9] = 0×00; // String Terminator (According to TS). Not really necessary since TS was echoing typed (non-zero) input from terminal

ZBTxRequest zbTx = ZBTxRequest(XBee_Addr64, NetworkAddress, ZB_BROADCAST_RADIUS_MAX_HOPS, ZB_TX_UNICAST, (uint8_t*) XBee_Data, OutputPacketLength, xbee.getNextFrameId());
xbee.send(zbTx);

Please advise as to what I am doing wrong. The XBee_Addr_64 and NetworkAddress were obtained from an input packet received after a button push on the remote.

By: Manuel

Manuel — Thu, 17 Feb 2011 12:03:42 +0000

Hello again Oleg,

Playing a bit more with the modules I’ve noticed that this error I told you about happens when the input voltage reaches values equal to n times Vref/4. At Vref I have 2.8V and the error occurs at 0.7V, 1,4V and 2,1V. Any help will be appreciated.

By: manuel

manuel — Wed, 16 Feb 2011 12:08:32 +0000

Do you think it is a current consumption issue or something like that? I’ll try to check the voltage regulator.

By: oleg

oleg — Tue, 15 Feb 2011 18:27:16 +0000

I have never seen such behavior in xbees. Have you already checked the power supply?