The past few pays I’ve been trying to get the MCP23018 working with the Teensy 2.0. I’m doing this to replace the firmware in my ErgoDox with my own since I can’t the the original ergodox-firmware to work. Finally I got the Teensy<->MCP23018 communication working so here is a summary of my experience. ...
I got the MAX756 that I was waiting for from Futurlec. The idea was to implement the very same circuit that comes in the MAX756 datasheet. In my first try I got very strange results which I posted to ladyada forum hoping to get some advice on how to solve. Eventually I set up the circuit in another breadboard and got it working the way I expected or at least I thought so. ...
Arduino Mega was released today. I already ordered mine from lawicel. As stated in arduino mega page: It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. I definitely will use those additional USARTS. The lack of a second USART was the main drawback of previous Arduinos for me.
In the past days I published a couple of arduino libraries. All coming from by XBee sensor development. I’m still waiting for the MAX756 to arrive from Futurlec, I need the MAX756 to power the xbee sensor with batteries and mount it in its final position. So in the meanwhile I’m cleaning a little bit the code, moving thing to libraries, etc. Now it’s the turn of the MMA7260Q, (see other posts about MMA7260q) . I created an Arduino library to use MMA7260Q as a Tilt Sensor that does autozero calibration. ...
As part of my Xbee sensor project, I created an object oriented API to access HMC6352 compass functionality and I decided to make it downloadable as an Hmc6352 Arduino Library. Just unzip the file in the $arduino_home/hardware/libraries/. At the end you should end with $arduino_home/hardware/libraries/Hmc6352. The library includes an example on how to use it (in File ⇒ Sketchbook ⇒ Examples ⇒ Library-Hmc6352 ⇒ Hmc6352. The example looks like this (also available as gist): ...
I talked about the DS1620 in a previous post. Now I created a DS1620 library for Arduino that has a more object oriented interface. The library has to be unpacked in the $arduino_home/hardware/libraries directory. After unzipping the library you should end up with a $ARDUINO_HOME/hardware/libraries/ds1620 directory. The library contains an example that can be accessed through the File ⇒ Sketchbook ⇒ Examples ⇒ Library-ds1620 ⇒ ds1620. ...
I finally put together an Arduino Pro Mini, the XBee, the MMA7260Q, the HMC6352, the TEMT6000 and the DS1620. This is how it looks like on the prototyping board (ugly, I know) Hopefully it would look better when I move it to the PCB. But before doing that I need to get the battery power set up. (I’m waiting for a MAX756 DC-DC voltage regulator and CoilCraft inductors to arrive) ...
at least according to Google Trends
If you run into this problem it means that you’re probably using the XBeeShield. Maybe you didn’t notice but if you take a look to the Arduino XBee Shield schematics you’ll find out that DIO7 (CTS - Clear to Send) on the XBee is wired to RST in the Arduino. And that’s why you get the Arduino reset. Even if you set DIO7 configuration to 0 - DISABLED (using X-CTU) the DIO7 will be set to HIGH then XBee enters sleep (This is stated in the “End Device Sleep Configuration”/“XBee End Device Configuration” chapter of the XBee Manual) . ...
I’ve playing with the MMA7260Q accelerometer. Following the indications in Measuring Tilt with Low-g accelerometers. Implementing Auto-zero calibration technique for accelerometers. AN3461 Tilt Sensing Using Linear Accelerometers. I connected X,Y and Z of the MMA7260Q breakout to A0, A1 and A2 of the Arduino. Then, GS1 and GS2 connected to ground to set the range to 1.5g. Ah, and of course, I connected ^SLEEP to VCC. I managed to put together this piece of code that ouputs the tilt angles ρ(rho) , φ(phi); and Θ(theta) in degrees. I does automatic autozero calibration so before getting sensible results you should tilt the sensor around +/-90 degrees in every axis. ...