Arduino Uno R3 Software
The Arduino Uno R3 is a microcontroller board based on the ATmega328P chip used mostly for development and prototyping. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. You can tinker with your Arduino UNO R3 without worrying too much about doing something wrong, worst case scenario you can replace the chip for about R35.00 and start over again.
Computer Arduino Uno R3 Software
Arduino Uno R3 Atmega328p Software
After receiving my first Arduino UNO, I soon realised that it will be impractical to use an UNO for every project. As with the Microchip family of MCUs, I wanted an easy way to program stand-alone circuits and chips.Searching the internet, it was clear that the Arduino IDE can cater for all my needs, and that no additional hardware will be required. The Arduino UNO can be programmed as an In Circuit Programmer with the supplied example sketch ArduinoISP and the UNO. There is thus no need for a separate programmer, or using AvrDude software for programming. A lot of examples on this was found on the internet.After some testing, it was clear that programming the AtMega328P was not as easy as I thought. Programming all depended on the AtMega328P chip. Does it already contained the bootloader, or is the chip blank?
Brock biology of microorganisms 13th edition powerpoint themes. Costs of a chip with bootloader is double that of a clean chip, so my first batch of chips was blank.What is the difference, you may ask. Designing the programmer shield, I looked at the requirements to program chips with and without bootloaders. First, I looked at the oscillator selection.OscillatorAtMega328P with bootloaderThe chip needs an external oscillator to be programmed, so this must be present on the shield.AtMega328P without bootloaderIf the chip was configured to use the internal oscillator, no additional components are needed.
However, if the chip was previously configured to use an external oscillator, an oscillator will be required. With an external oscillator, both types can be programmed.It is clear that adding an external oscillator to the shield, will accommodate all types of chips. A 16MHz crystal and 2 x 15pf capacitors, or a 16MHz resonator can be used.LED indicationsThe source code or sketch indicated 3 outputs that can be connected to LEDs. This indications should be present on the shield.Resetting the programmerWith a shield placed on top of an Arduino UNO, the UNO reset button is normally out of reach.
The shield should include a separate reset button.Powering the chip to be programmedThe chip that needs to be programmed, must have power connected to it. For the supply, the +5V and 0V is taken from the Arduino UNO board. However, inserting and removing a chip from the programmer with supply on, might cause damage to the chip.
For this reason, a switch was added to the shield.I/O Port protectionThe ArduinoISP shield sets certain pins as OUTPUT on the Arduino UNO. If one now connect a previously used AtMega328P to the programmer, there can be conflict between the two chip's I/O lines that can cause damage to the ports. For protection, I added 470R resistors between the programmer, and the chip to be programmed.Reset line of chip to be programmedTo ensure a stable reset circuit for the chip to be programmed, I added a 10K pull-up resistor to the RESET line.Programming MethodZIF SocketThis will be an easy way to program stand-alone chips, or to burn the bootloader on new chips. I thus added the ZIF socket to the design.Programming cableAs almost all my designs are stand-alone circuits, my programming and development is done on breadboard.
Arduino Uno R3 Software Download
Thereafter, program updates are done via programming headers on the final circuit board. For this reason, I added the programming cable to the design. I designed a PC Board with the free version of Eagle, and the shield fits directly onto the Arduino UNO. After designing the layout of the board, I noticed that the space taken up by the ZIF socket as well as the standard programming cable leave me with two options:- use normal 1/4W resistors, which will leave no space for labels, or - use SMD resistors which is more work, but will leave space for the labels.My final PCB design uses SMD resistors, soldered to the solder side of the board. I used a 16MHz resonator as oscillator, but this can easily be changed with a crystal and 2 capacitors.The power switch is connected such as to switch off the +5V to the ZIF socket, as well as the programming headers.
This give more options when doing development on stand-alone circuits. Due to the limited space for the shield, the power switch was placed where the A0 - A5 pins are located on the Arduino. As these pins are not used for programming, they were omitted.Building the circuit is quick using the PC Board. The standard header pins used to connect the shield to the Arduino, was modified. Using needle nose pliers, the header pins were pressed flush with the black plastic, and inserted from the component side.Finally, I added labels to the LEDs and programming header. To burn the bootloader to the chip:- Insert the chip into the ZIF socket.
Goto Tools - Burn Bootloader - Programmer LEDs will indicate programming status - On completion, the OK LED will again fade on/offTo burn a sketch to the chip- Insert the chip into the ZIF socket. Goto File - Upload Using Programmer - Programmer LEDs will indicate programming status - On completion, the OK LED will again fade on/offThe same method can be used to program an AtMege328P in a stand-alone circuit (breadboard or PC board) using the programming cable. For stand-alone circuits, it is normally required that they are powered up via their own supply. If no supply is available, and the circuit does not require a lot of power, the circuit can be power from the programming shield by switching on the +5VNOTE: Always ensure that you switch off the power switch (+5V LED off) before inserting or removing a chip into the ZIF socket, or before connecting/disconnecting the programming cables to the stand-alone circuit. Hi EricThank you very much for sharing your proyect. I found very useful the idea of the board fitting on the (omnipresent) arduino uno, so I toke your board design, I built it and it worked like a charm.Anyway, when I was working with the printed (I migrated the files to Altium's CM) it seemed to me that the labeling for the isp header was not completely correct. I think that the order should be SCK, MISO, MOSI, RST, 5V, 0V.Since for ISP purposes I use to connect the programming cable directly to the arduino ICSP six-pin connector, I did not check it, but it was the impression I had following the leads.