RFduino connected to HC-05 bluetooth
I was looking for a system able to work with an iPhone (Bluetooth Low Emission – LBE) and a standard android (Standard bluetooth / rfcom). The RFDuino Arduino platform I have is perfect for BLE so, I decided to add a HC-05 module for the standard bluetooth.
Here is the description on how to make it !
With the 16×16 123RGB panel base on WS2812b, I have 256leds able to consume up to 50mA each. I want to use this with a limited current under 3A and want to ensure using software, this limit will not be reached. This article detailed my code for doing this.
Each led value is stored in a int array where each value is containing rvb values.
As described in a previous article, I’m investigating ws2812b leds provided with RGB123 board. These leds are providing a lot of light, which is a good thing but also require large power supply to light them on. As in my system, I want to control power to not overload the battery, I’m tring to predict current need and limit it.
In fact, the final equation is really easy to get. According to my different measures, the current is really linear for each of the color, equal for each of them too.
As a consequence, the final current estimate is :
I(mA) = 1 + R/16 + G/16 + B/16
Recently I made a presentation on Internet of Things for ClermontTech ApiHour show ; normally video should be published soon. For those who are interesting in this topic, here are the slides with the associated comments.
http://slid.es/disk91/internetofthings
Have fun !
The last step to use a ATMega328P / Yabbas from the Arduino IDE is to plug it with a FTDI cable (TTL RS232 over USB). Personnally, I’m using the TTL-232R-3V3 to do it. The first step was to create an adaptor to transform this cable output to the YABBAS pinout.
Recently I made a Yabbas arduino system ; this is a low cost arduino (7€) you can DIY. I’ve made it with a group of people from my city (look here) and my daughter. During this session we have finished the prototype but not had the time to flash the AtMega328P.
Now this is done using my Arduino Leonardo as an ISP programmer. I’ll detail the way I’ve done it here
Galileo is an Intel platform compatible with arduino ; more of that it is an embedded Pentium class platform. With 400MHz and 800mA and 55€ with Ethernet but no video out, I’m not totally sure this platform provides a real new thing in the embedded world.
By the way, it have some interesting advantages :
I let you have your own advice, to take a look to the detailed description here and buy it here (actually 9w delay)