This is the third part of an ongoing series about building a low cost, open source streaming internet radio. Granted, there are many more powerful routers out there that have USB support, will run Linux in various forms, and have built-in WiFi. To convert this router into a powerful embedded system , we need to make a couple modifications. First, we need to throw out the stock firmware. It turns out that this router, like many others, runs Linux from the factory. Thankfully, there are several open source Linux distributions available that support this router, including my favorite, OpenWrt. In addition, Asus has made it fairly straightforward replace the stock firmware with our own custom Linux build which can include all the programs, drivers, and utilities we can cram into 4MB of flash. Before we start hacking the router, there are a couple things I should mention: From this point onward, your warranty is toast.
Program an ATtiny With Arduino
The 2 players automatically win and lose so their scores show the hours and minutes. All the parts are easily available on eBay and the software code is free! The clock has lots of different display modes to choose from:
A Guide To using IMU (Accelerometer and Gyroscope Devices) in Embedded Applications. – This article discussed the theory behind accelerometer and gyroscope devices. It shows a simple Kalman filter alternative, that allows you to combin.
This does not change the price of any of the items for sale. However, I earn a small commission if you click on any of those links and buy anything. I reinvest this money into materials and tools for future projects. If you would like an alternate suggestion for a supplier of any of the parts, please let me know. Add Tip Step 2: Upload the sketch to your Arduino as you would any other sketch.
Here are some tips I’ve discovered for making better use of the existing pins, or finding an extra pin. Sharing inputs How many inputs do you need to use to sense n pushbuttons? The simplest method is to connect each pushbutton to a separate input. This requires n inputs. A less obvious trick is to connect several pushbuttons to a single analogue input using a resistor ladder to give each button a different voltage.
Here’s an example with five buttons:
In the mid s large numbers of small FM transmitters, operating in the FM radio broadcast band ( MHz) appeared on the market. It started with a self-build kit from the Danish manufacturer Jostykit that allowed everyone to build a small FM transmitter for a few Euros.
Simple Tones for ATtiny 4th April For a recent project based on the ATtiny85 I wanted to play some simple tones through a piezoelectric speaker, but unfortunately the Arduino tone function isn’t supported on the ATtiny85 because it doesn’t have the appropriate timers. I therefore needed to find a replacement way of generating simple tones. There are several existing tone libraries for the ATtiny85, but they all seemed overcomplicated for what I wanted.
This post describes my simple TinyTone function which takes advantage of the ATtiny85’s prescaler to provide a compact tone routine that only needs a table of 12 divisors. TinyTone procedure Here’s how my TinyTone function works. This divides the clock frequency, which is either 1MHz or 8MHz, by a prescaler, and then by a one-byte counter. The square wave is output on digital output 1. Because the prescaler divides the clock by a power of two it provides a convenient way of generating the octave.
TinyTone divisor, octave, duration We then just need a table of divisors for the notes within one octave. To calculate the divisor for a given note frequency we first work out: We will define a constant for each divisor to save having to remember them; for example C is:
A Guide To using IMU (Accelerometer and Gyroscope Devices) in Embedded Applications.
Power Supplies A constant current source source can supply a fixed current to a load regardless of input voltage or load change. The LM is quite useful as a constant current source, works on a wide input voltage range, from 3V up to 40V. The circuit is rather simple, uses only one transistor and few passive components and performs well in terms of frequency stability, almost zero drifting after about 4 hours of continuous operation.
· Tiny AVR Programmer Hookup Guide A Tiny AVR Programmer with an ATtiny85 inserted. When plugging your ATtiny into the socket, take note of the notch on both the socket and the white silkscreen on the PCB. This should match the polarity of the › Home › Tutorials.
Thanks to Daniel Le Guern! You can research all those and achieve wonderful but complex results. My way of explaining things require just basic math. I am a great believer in simplicity. I think a system that is simple is easier to control and monitor, besides many embedded devices do not have the power and resources to implement complex algorithms requiring matrix calculations.
We’ll use parameters of this device in our examples below. This unit is a good device to start with because it consists of 3 devices: Now that’s a fancy name!
Schematic The heart of this project is the ATtiny85 which, although small in size, packs enough punch for this project. For our activity sensing needs, I am using the MMA LC 3-axis accelerometer which outputs each axis on a different analog line. This accelerometer also has a sleep mode that can be activated by the microcontroller to improve battery life. Our activity reminders will come through a disc vibration motor which, despite its small size, is powerful enough to be felt without drawing attention to your lethargic lifestyle.
Everything can be wired up according to the following wiring diagram: Wiring A big part of this project is the form factor.
· This little circuit sits nicely ontop of an Arduino board and lets you quickly plug in an ATtiny chip for programming using the Arduino “language” and IDE to write the code, and the Arduino board as an ISP programmer to upload the code to the tiny ://
FM Transmitters Powerful microtransmitter that can cover 3km range. In our case the output power is about mW depending on the input power of 10mW and 9V battery power supply. The transistor Q1 must be mounted with a heatsink, the heatsink must have small dimensions cylindrical in order not to increase the parasitic capacitance. The trimmer R2 serves to adjust the bias of the transistor, start with the trimmer fully open and close by measuring the current absorbed by the 9V, in my case you get mW at the output with a current of 50mA not increase this value as you only increase the absorption by heating the transistor without increasing output power, because the input power is too low.
Clearly the 9V battery will be able to provide 50mA only for a few hours, if necessary have greater autonomy should be used a larger battery, but it is no longer a bug but simply an FM transmitter. FM Transmitters This tiny Mhz FM transmitter bug measures just 10mm x 17mm in size and as you can see in the photos the biggest components are just the microphone and the battery.
You can use a small microphone from an older cell phones, they are small in size and have an excellent sensitivity. For an effective power supply the 9V battery Duracell is excellent and allows several hours of battery life, but if you want to have a smaller size it is better to use 2 or 3 lithium cells like the used in PCs. The circuit works well from 3 to 12V, the maximum range is obtained with 12V and a piece of cm cable as an antenna.
Click on the Disclaimer button prior to taking any action shown on this website. See the disclaimer for more information. In order to program an ATTiny85, you need to accomplish a few tasks. First, you need to download the Arduino IDE Integrated Development Envrionment , which is a fancy way to say the interface software for these microcontrollers.
Great USB programmer for ATtiny Works on Linux! Compatible with Arduino IDE! In order to set it up, I would recommend looking up SparkFun “Tiny AVR Programmer Hookup Guide” on Google.
You need a special programmer and some fancy. The Arduino has largely done away with these issues. The bootloader is basically a. It does two things. First, it looks around to see if the computer is trying to program it. If it is, it grabs the program from the computer and uploads it into the ICs memory in a specific location so as not to overwrite the bootloader. That is why when you try to upload code, the Arduino IDE resets the chip.
This basically turns the IC off and back on again so the bootloader can start running again. Once it locates and runs your program, the Arduino continuously loops through the program and does so as long as the board has power. Why Install a Bootloader If you are building your own Arduino, or need to replace the IC, you will need to install the bootloader. You may also have a bad bootloader although this is very rare and need to reinstall the bootloader.
Tiny AVR Programmer
· The Tiny AVR Programmer is a general AVR programmer, but it’s specifically designed to allow quick-and-easy programming of ATtiny85’s (as well as 45’s). It has an on-board socket, where the little 8-pin IC can be plugged in and directly