Search found 9 matches

by coryduce
Fri Feb 03, 2012 2:00 pm
Forum: Arduino
Topic: Pro Mini 5V & 3.3V I2C (MMA8452Q) not communicating
Replies: 4
Views: 6132

Re: Pro Mini 5V & 3.3V I2C (MMA8452Q) not communicating

Try this: -Modify the wire library so that the internal pull ups are not used -Remove all your level shifters -Connect the I2C pins on the UNO directly to the I2C pins on the BoB -Use the 3.3v pin on the UNO to provide power to the BoB -Add external 4.7K pullups to the SDA and SCL lines. Connect the...
by coryduce
Fri Feb 03, 2012 1:41 pm
Forum: GPS
Topic: EM-408 Trouble
Replies: 1
Views: 1845

Re: EM-408 Trouble

Zonk, Pin 0 and 1 on the UNO are the hardware serial port pins used for programming the UNO and for sending messages between the UNO and the computer. You can't use the same serial port pins for communication with both the GPS and the computer at the same time. You need to connect the GPS to differe...
by coryduce
Wed Feb 01, 2012 4:32 pm
Forum: Wireless/RF
Topic: How to send data wirelessly?
Replies: 4
Views: 2050

Re: How to send data wirelessly?

Patrick, We are working on a sub GHz Arduino based wireless module right now that might work for what you are doing. http://blog.ckdevices.com/?p=119 It would fulfill your range, low power, number of nodes, and data rate requirements. I've been doing testing with the library from open.com.au, which ...
by coryduce
Mon Jan 02, 2012 12:34 pm
Forum: Everything ARM and LPC
Topic: Connecting Crossworks to Olimex-Arm-USB-OCD
Replies: 6
Views: 2329

Re: Connecting Crossworks to Olimex-Arm-USB-OCD

When you are trying to program, are you also powering the board through the USB port?
by coryduce
Mon Jan 02, 2012 12:14 pm
Forum: Arduino
Topic: Need to run ATMEGA @ 8MHZ, instead of 16MHZ
Replies: 1
Views: 1712

Re: Need to run ATMEGA @ 8MHZ, instead of 16MHZ

You have a few options: 1) Use level shifters. Add level shifters to allow your 5V processor to interface to your 3.3V logic. Depending on what you are interfacing to, this may be as simple as a few resistors, or as complicated as a few more chips or FETS. 2) Change the regulator. Even though it is ...
by coryduce
Mon Jan 02, 2012 7:09 am
Forum: Everything ARM and LPC
Topic: Connecting Crossworks to Olimex-Arm-USB-OCD
Replies: 6
Views: 2329

Re: Connecting Crossworks to Olimex-Arm-USB-OCD

Try reducing the JTAG clock frequency by increasing "JTAG Clock Divider" to something like 15 or 20. I don't have the software on this computer, but I think you can get to that setting by right clicking on the "Olimex-Arm-USB-OCD" item in the targets window and selecting properties. If that doesn't ...
by coryduce
Mon Jan 02, 2012 6:32 am
Forum: Wireless/RF
Topic: Help connecting RN-42 Bluetooth module to ATMEGA328
Replies: 1
Views: 1823

Re: Help connecting RN-42 Bluetooth module to ATMEGA328

Take a look at the schematic for the Bluetooth Mate Silver. It uses the RN-42 module.
http://www.sparkfun.com/products/10269
Of course, if your Atmega328p is running at 3.3V, you won't need any of those level shifters or the regulator, but it will show you which UART pins to connect to.
by coryduce
Mon Jan 02, 2012 6:10 am
Forum: Arduino
Topic: Arduino iPhone Dialer
Replies: 1
Views: 552

Re: Arduino iPhone Dialer

The 30-pin connector has a UART on it that can be interfaced with an external micro, but I don't remember ever seeing a command that allowed to you to dial a number. Most of the UART iAP commands are for controlling the ipod functionality of the iPhone. On a project I was working on, we wrote an iPh...
by coryduce
Sun Jan 01, 2012 12:23 am
Forum: Arduino
Topic: Interfacing with Transceiver HopeRF RFM22B
Replies: 6
Views: 3414

Re: Interfacing with Transceiver HopeRF RFM22B

I've also used the FM22 library from http://www.open.com.au/mikem/arduino/RF22/ with good results, but it is on a board that is running at 3.3V http://blog.ckdevices.com/?p=119 . When you interface with the UNO are you doing any level shifting on the communication lines between the UNO and the RFM22...