I plan on implementing this module in one of my designs. Checking out the datasheet I see that the reset pin is active low and that the ‘default’ connection as it calls it is “Input to RN41 with 1k pull up”. Checking out some schematics of designs using this device from SFE I see a pulldown resistor is used… Im assuming I need to use the pulldown resistor. Could someone confirm this?
also I’d like a little more information on the UART_RTS and UART_CTS pins respective functions… I noticed that on the 6DOFv4 imu (iirc) they are just tied together… what function does this provide?
I have personally just left the reset line floating (no connection) without any issues as the module provides it’s own reset at power up. The RTS should be connected to CTS if you are not using any handshaking. If you are running at high baud rates, you should connect these pins to your micro and provide handshaking code to insure no data loss.
okay so when you tie them together its just telling itself that its clear to send data and hooking it to my micro will allow ME to tell it when its clear.
Ive done a bit of reading on UARTs but unfortunately haven’t had the opportunity to establish such communication in practice yet…
I just want to make sure I do things right with this because I cant use a breadboard to prototype with so im having a board made and any mistake will be a costly one.
This looks like the setup Ill go with although I might end up connecting RTS and CTS to the mcu since Ill have some spare I/O and I assume Im just checking for when the device fires out a request to send bit…
Not to hyjack the thread, but I have a question about the RN-41;
Can you use both the UART and USB interfaces on the chip at the same time? I am trying to send a video stream and GPS data from a model rocket as it launches. I have an USB Video capture card that I was going to install in the rocket so that I dont have to have an analog transmiitter aswell. I would like to have only a single transmitter, and was wondering if this was possible.
you will have to use level converter if you are using 5V. would be nice idea if you post your final schematic here for a review just to make sure there are not many expensive mistakes
second poster
for USB you will need a USB host and RN-41 is not USb host. You cannot plug it in directly and even if you could the datarate is too small for digital video transmission in real time.
Thanks. Do you know of something that might do the job? such as the bluegiga WT-11 or WT-41?
I though that the transmitters wouldn’t have the bandwidth for a video transfer, but that is then why i decided to put my video capture device in the rocket itself. I’m working on the theory that this capture card is really cheap and works on USB 1.0 might suggest that it has a much lower bandwidth.
i am not expert but i think until you have USB host capabiilities in bluetooth module you cannot attach any USB devices to it.
Two USB slave devices cannot speak to each other, one of them has to be a host device and it looks like your camera and bluetooth devices will be USB slaves. Only a few devices have usb host capabiliteis, like PC’s, high end PDAs and some development boards that come with USB host firmware
but again, i may be wrong, best to get further opinion
I have been looking around was wondering if the following is possible. The FTDI Vinculum-II Chip has 2 USB ports which can all be used simultaneouly.
The two USB ports can act as either Slaves to connect to PC’s or as Host Ports, or any combination of the two. This would, if i am correct, allow me to configure both ports as Host Ports, to one of which i could connect the RN41 (or Bluegiga WT11), and to the other, connect my video capture device. That would allow me to have a control center for the USB ports.
Does that sound sensible?
EDIT:
The VDIP1 Module seems to be a workable solution, Do you reckon I could connect one of its USB ports to the Video card, and the other to the RN41? And if so, does anyone know if Windows will detect that there is a USB device on the end of the Bluetooth link?
