A Gentle Introduction to Netduino, great starter! [via]
This “guide” started as pretty basic article and turned into a slightly more expanded guide on electronic design and programming techniques for Netduino. To knowledgeable users, some topics may seem gone too much in depth and detail even for “basic” subjects. However, the aim was to provide beginners with knowledge and confidence they need to become advanced enough so that to design successful microcontroller projects by themselves. Additionally, it is always a good idea to understand how things work, even when we can achieve the results using LEGO approach with shields.
A Gentle Introduction to Netduino – [Link]
Arduino has an analogWrite function. But how do you convert a PWM signal to a voltage?
It covers basic PWM, changing your PWM freqency, and and to design a simple R/C filter, including making use of some great online tools.
Arduino’s AnalogWrite – Converting PWM to a Voltage - [Link]
HOW TO – build a $23 graphic LCD shield… from thoughtfix in the Adafruit customer forums.
All I did was follow the instructions for the Nokia 5110 LCD EXACTLY how they were described at http://ladyada.net/products/nokia5110/ with two notable exceptions. First, I used +5V (shown in the pink wire in the drawing, white wire on the results) for the LED backlight. Second, I followed the pin traces around the proto shield used in the example and built that onto the underside of the Adafruit proto shield!
I had difficulty with the wire at such short runs. Specifically, I had insulation shrinking when I set the soldering iron hot enough to melt the solder to the wires. A more experienced person (or higher quality wire insulation) could avoid this. The LED uses one of the +5V rail connectors on the Proto Shield’s PCB and the “open” rail gathers 3.3V to share with the LCD and the driver.
HOW TO – build a $23 graphic LCD shield - [Link]
Earlier this week we posted about Carlos Agell’s project which allows the acquisition of analog camera images by an Arduino. Carlos has updated this project for use with a Processing sketch instead of the costly LabVIEW required in the original design.
Update on Arduino imaging – Processing sketch + video – [Link]
2.8 TFT Touch Shield for Arduino. Spice up your Arduino project with a beautiful large touchscreen display shield with built in microSD card connection. This TFT display is big (2.8″ diagonal) bright (4 white-LED backlight) and colorful (18-bit 262,000 different shades)! 240×320 pixels with individual pixel control. It has way more resolution than a black and white 128×64 display. As a bonus, this display has a resistive touchscreen attached to it already, so you can detect finger presses anywhere on the screen.
2.8 TFT Touch Shield for Arduino - [Link]
The Mosquino is a new Arduino variant, designed to work with much lower-capacity power supplies than the standard USB/7805 5 volts, such as those delivered by solar cells or small batteries. While it isn’t physically shield compatible with the Arduino, it does boast some unique and useful features, such as:
- compatibility with the Arduino toolchain and portable IDE
- power supply shields — effectively giving you multiple, easy-to-swap PSUs while keeping your program and digital circuit hardware intact.
- uses an ATMega644, which provides twice as much program memory as the ’328.
3 (three!) Mosquino-compatible shields can be connected at once without stacking, due to redundant pinouts.
prioritization of power supply (USB > battery).
- FTDI operates from isolated power line, so no draw on circuit when the computer isn’t connected.
- hardware real-time clock and 3 interrupt lines, to encourage event-driven operation and programming.
- 0.1″-grid pinout for shields so you can develop on perfboard.
- still fits in an Altoids tin.
Mosquino is based on the Sanguino design using the Atmel Atmega644PA and family microcontrollers. It turns out the name Sanguino literally translates as “bleeding”! In keeping with the theme, this parasitically-powered board is a “little bloodsucker”. Don’t worry, it doesn’t drink much. (Also, the name Draculino is already used.)
Mosquino: An Arduino-Based Energy Harvesting Development Board – [Link]
Robert Davis writes:
I have obtained two Silent Radio LED signs on Ebay and I intend on rebuilding them. To get one of them apart I had to reach through a hole in the back and cut the wires to the power transformer. To remove the logic board I had to use pliers on the screw head and pliers on the mounting shaft. In one case the screw broke off rather than come out. Tin sheers or heavy duty wire cutters can be used to remove the connectors between the sign and the logic board.