astar 32u4 tft display factory

This diagram identifies the I/O and power pins on the A-Star 32U4 Prime (LV and SV versions); it is also available (along with the power distribution diagram below) as a printable PDF (1MB pdf). For more information about the ATmega32U4 microcontroller and its peripherals, see Atmel’s ATmega32U4 documentation.

The outermost rows of pins of the A-Star 32U4 Prime correspond to the pins on an Arduino Leonardo, and each is duplicated on a second inner row for more convenient access. Printed on the A* circuit board are indicators that you can use to quickly identify each I/O pin’s capabilities: a triangle by the inner through hole means the pin can be used as an analog input, and a square wave symbol next to the hole pair means the pin can be used as a PWM output.

The A-Star 32U4 Prime matches the Arduino Leonardo and the Arduino Uno R3 in the shape of its circuit board and the arrangement of its pins. Furthermore, it uses the same ATmega32U4 microcontroller as the Leonardo, running at the same voltage and frequency, so the A* should generally work with any shield or accessory that is compatible with the Leonardo (including our Zumo Robot for Arduino).

A yellow user LED is connected to Arduino pin 13, or PC7. You can drive this pin high in a user program to turn this LED on. The A-Star 32U4 Bootloader fades this LED on and off while it is waiting for a sketch to be loaded.

A green user LED is connected to PD5 and lights when the pin is driven low. While the board is running the A-Star 32U4 Bootloader or a program compiled in the Arduino environment, it will flash this LED when it is transmitting data via the USB connection.

A red user LED is connected to Arduino pin 17, or PB0, and lights when the pin is driven low. While the board is running the A-Star 32U4 Bootloader or a program compiled in the Arduino environment, it will flash this LED when it is receiving data via the USB connection.

The AStar32U4Prime library contains functions that make it easier to control the three user LEDs. All three user LED control lines are also LCD data lines, so you will see them flicker when you update the LCD. The green and red user LEDs also share I/O lines with pushbuttons (see below).

The A-Star 32U4 Prime has four pushbuttons: a reset button next to the power switch and three user pushbuttons located along the right edge of the board. The user pushbuttons, labeled A, B, and C, are on Arduino pin 14 (PB3), PD5, and Arduino pin 17 (PB0), respectively. Pressing one of these buttons pulls the associated I/O pin to ground through a resistor.

The three buttons’ I/O lines are also used for other purposes: pin 14 is MISO on the SPI interface, PD5 and pin 17 control the green and red user LEDs, and all three pins are LCD data lines. Although these uses require the pins to be driven by the AVR (or SPI slave devices in the case of MISO), resistors in the button circuits ensure that the A-Star will not be damaged even if the corresponding buttons are pressed at the same time, nor will SPI or LCD communications be disrupted. The functions in the AStar32U4Prime library take care of configuring the pins, reading and debouncing the buttons, and restoring the pins to their original states.

The assembled versions of the A-Star 32U4 Prime come with a buzzer that can be used to generate simple sounds and music. The buzzer is not present on the SMT-only versions, but the buzzer driver circuit is still populated, allowing you to solder in your own buzzer or speaker. The stock buzzer is available as part of the A-Star 32U4 Prime accessory pack.

A through-hole jumper next to the buzzer provides a way to connect the buzzer input to digital pin 6 (which also serves as OC4D, a hardware PWM output from the AVR’s 10-bit Timer4). If you alternate between driving the buzzer pin high and low at a given frequency, the buzzer will produce sound at that frequency. You can play notes and music with the buzzer using functions in the AStar32U4PrimeBuzzer library.

Some versions of the A-Star 32U4 Prime include an onboard microSD card connector that enables the microcontroller to read from and write to microSD memory cards. The card socket is connected to the SPI interface on the ATmega32U4 through level-shifting circuits, allowing the 5 V microcontroller to safely communicate with standard 3.3 V SD cards. DI, DO, and SCLK on the card are connected to MOSI, MISO, and SCK on the AVR, respectively. The Arduino SD library can be used to access the file system on an inserted microSD card.

The A-Star 32U4 Prime has a mounting location for a 2×7 header where you can connect a character LCD with the common HD44780 parallel interface (109k pdf). The A* is optionally available with a male header installed here and an 8×2 character LCD (with corresponding female header) included; on other versions, you can add your own display using the connectors of your choice. A larger LCD can be connected with a ribbon cable and optionally a shrouded box header.

The LCD control lines are broken out to a column of through holes next to the LCD connector, labeled on the back side of the board. By default, some of these are connected to I/O lines from the ATmega32U4 to allow control of the LCD in 4-bit mode, but you can remap the connections by cutting the surface-mount jumpers indicated in the picture below and making new connections between I/O lines and LCD control pins.

The AStar32U4PrimeLCD library provides functions to display data on a connected LCD. It is designed to gracefully handle alternate use of the LCD data lines by only changing pin states when needed for an LCD command, after which it will restore them to their previous states. This allows the LCD data lines to be used for other functions (such as pushbutton inputs and LED drivers).

The A-Star 32U4 includes a USB Micro-B connector that can be used to connect to a computer’s USB port via a USB A to Micro-B cable (not included). The USB connection can be used to transmit and receive data from the computer, and a preloaded USB bootloader makes it possible to program the board over USB. The USB connection can also provide power to the A-Star.

The A-Star 32U4 Prime can either be powered directly from the USB 5 V supply or from an external voltage source, which is regulated to 5 V by its onboard switching regulator. The slide switch on A* controls whether the external source is connected to the input of the regulator, providing a convenient way to switch off external power to the A-Star without unplugging any connections. The adjacent set of three pins provides a place to connect your own power switch: to enable external power, connect the middle pin to ground (accessible through the upper pin).

In some situations, it might be undesirable for the A-Star 32U4 Prime to draw power from an external source when it is connected to USB, even if the power switch is left on. If this is the case, the regulator can be disabled by driving the regulator shutdown pin, SHDN, high; this shuts down the regulator and causes the power mux to fall back to USB power. For example, this could allow a battery-powered system to automatically turn off the regulator while it is connected to a computer.

When the A-Star 32U4 Prime is being powered through Power In, the sum of the 5V output current, 3V3 output current, GPIO output current, and current used by the board itself should not exceed the maximum current that the switching regulator can provide.

In a battery-powered application, it might be useful for the A-Star to monitor the battery’s voltage level. The BATLEV pin provides access to a voltage divider that outputs a fraction of the VIN voltage (one-third on the ac03b LV, one-fourth on the ac03e LV, and one-eighth on the SV), and this voltage can be read by connecting it to the adjacent analog pin 1 (A1) (or another analog input). The readBatteryMillivoltsLV3(), readBatteryMillivoltsLV4(), and readBatteryMillivoltsSV() functions in the AStar32U4 library can be used to determine the battery voltage from this reading.

We recently released the A-Star 32U4 Micro, which we think is the best available AVR breakout board for its size. If you are like us, you enjoy taking factory tours, seeing how things are made on

On the Fritzing schematic are indicated by dotted lines, the implicit connections between the Feather and Fether Wing. The TFT connections are shown, as well as the on/off button. This button connects the Enable pin to Ground to disable the 3.3V on-board regulator. The Li-Po battery can last several weeks/months in this way, depending on its capacity. When you turn on the device, a battery level indicator will tell if recharge is needed. If you have cut the box in front of the USB port, you can charge the LiPo by simply plugging the USB to a 5V socket. The same USB connector can be used to communicate with your PC for programming and time adjusting (once a month, to keep the error below 3.5s!) or once a year if you use the latest software version!

- Feather32u4_Adalogger-time_setting.ino : This one is setting the RTC to the compile time given by your PC, which is only close to the exact time. After loading this code, you can see on the Serial Monitor the time set in your RTC. Open a browser and read the exact time from Time.is. Compare the seconds. If your RTC time is lagging, by e.g. 5s, write 5 in the top part of the Serial Monitor and press Enter on your PC keyboard. Use -3 for a watch advancing by 3s. You will see on the Serial Monitor the updated time. Repeat the procedure until the "visual error" is less than 1s. Corrections less than 1s are not possible (yet!). You can set also an alarm (start and duration) in the code. This is only useful for daily alarms, of a given duration. A pin is set HIGH for the duration of the alarm, if the RTC clock is not sleeping. This means, you should power on the clock by USB continuously (The LiPo battery can be disconnected in this case). The external LED is set for testing this feature. Other uses of this feature, such as wake up on music, are up to you! Now the exact time is set in the RTC.

- Feather32u4_Adalogger-TFT-time_reading-ring5.ino: This is version 5, an improved one! If powered by USB, connect a USB cable to PC or USB power adapter. Otherwise, by simply pressing the side button, if you are using a LiPo battery, you could read on the TFT display, the date, day, time, alarm (start and duration) and the battery level (as image). It is possible that the indicated seconds are not exactly as you have set them in the first step, for an unknown reason, but not always! In this case, mark the difference and repeat the first step.

First improvement is a monthly correction, bringing the annual error to less than 6 seconds. The adjustment is stored in the RTC registers, so no need to keep powered the Adafruit Feather 32u4 Basic Proto. This new version checks also the status of the backup battery of the RTC, which should be normally replaced after several years. This is described on the dedicated page.

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This is a C++ library for the Arduino IDE that helps access the on-board hardware of the A-Star 32U4 controllers, which is a family of programmable controllers from Pololu based on the ATmega32U4. You can program an A-Star 32U4 directly from the Arduino IDE without using this library, but this library makes it easy to:

(Not all of these features are available on every A-Star 32U4. For more information about each particular A-Star controller, please refer to their documentation and respective product pages.)

Move the "AStar32U4" folder into the "libraries" directory inside your Arduino sketchbook directory. You can view your sketchbook location by opening the "File" menu and selecting "Preferences" in the Arduino IDE. If there is not already a "libraries" folder in that location, you should make the folder yourself.

Several example sketches are available that show how to use the library. You can access them from the Arduino IDE by opening the "File" menu, selecting "Examples", and then selecting "AStar32U4". If you cannot find these examples, the library was probably installed incorrectly and you should retry the installation instructions above.

You should avoid adding extra #include lines such as Pushbutton code included in the AStar32U4 library. The only #include line needed to access all features of this library is:

For complete documentation, see https://pololu.github.io/a-star-32u4-arduino-library. If you are already on that page, then click on the links in the "Classes and functions" section above.

1.1.0 (2019-03-05): Added readBatteryMillivoltsLV4 and readBatteryMillivoltsLV3 functions to support both A-Star 32U4 Prime LV (ac03e) and existing LV A-Stars. Deprecated readBatteryMillivoltsLV.

The A-Star 32U4 Micro breaks out 15 general-purpose I/O lines along two rows of pins, including 7 usable as PWM outputs and 8 usable as analog inputs. It fits all this into a 20-pin dual in-line package (DIP) measuring only 1″ × 0.6″ (even smaller than competing ATmega32U4 boards like the Teensy 2.0 and Pro Micro), and its 0.1″ pin spacing makes the A* easy to use with 0.1″-pitch connectors.

The A-Star 32U4 ships with a preloaded Arduino compatible bootloader (which uses 4 KB of flash memory, leaving 28 KB available for the user program). We provide a software add-on that enables the board to be easily programmed from the Arduino environment. The A-Star 32U4 uses the same microcontroller as the

The board can either be powered directly from the USB 5 V supply or from a separate 5.5 V to 15 V source on the VIN pin, which is reduced to 5 V by a 100 mA low-dropout (LDO) regulator; you can access this 5 V supply through the 5V power output pin. Additionally, the ATmega32U4 contains an internal 3.3 V regulator whose output is available on the 3V3 pin. Current drawn from the 3V3 output should not exceed about 50 mA, and when the board is being powered through VIN, the sum of the 5V output current, 3V3 output current, GPIO output current, and current used by the board itself (typically about 25 mA) should not exceed 100 mA.

A-Star 32U4 Prime LV는 ATmega32U4 AVR 마이크로 컨트롤러를 기반으로하고 일반적인 Arduino 폼 팩터로 배열 된 프로그래밍 가능한 보드입니다. A-Star Prime은 2V 에서 16V까지의 효율적인 작동을 가능하게하는 우수한 전력 관리를 포함하여 경쟁 제품에 비해 많은 추가 기능과 개선 사항을 제공합니다 (시작시 최소 3V가 필요함).

The A-Star 32U4 Prime LV is a programmable board based on the ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from2 V to 16 V(though it requires at least 3 V at start-up). This configuration of the A-Star 32U4 Prime LVincludes microSD support,preinstalled female headerscommon to many Arduinos, and a removable8×2 character LCD.

The Pololu A-Star 32U4 Prime is a general-purpose programmable board based on the ATmega32U4 AVR microcontroller from Microchip (formerly Atmel) and arranged in the common Arduino form factor exemplified by theUno R3andLeonardo. As such, the A-Star Prime (abbreviated A* Prime) is compatible with many Arduino shields, including all of theArduino shields we carry. All 26 of the microcontroller’s GPIO lines are accessible on the board, including seven than can be used as PWM outputs and twelve that can be used as analog inputs. The ATmega32U4 is capable of native full-speed USB, which makes it more versatile than similar boards that rely on USB-to-serial adapters: in addition to supporting a virtual (CDC) serial/COM port interface, the A-Star can appear to a connected computer as a mouse and keyboard. The A-Star’s USB interface can be accessed through its USB Micro-B connector.

All 26 general-purpose I/O lines from the ATmega32U4 are broken out (including PB0, PD5, and PE2); 7 of these can be used as hardware PWM outputs and 12 of these can be used as analog inputs

This configuration of the A-Star 32U4 Prime LV includesmicroSD supportand isassembled with through-hole componentsas shown in the picture above so that all the basic features can be used without any additional soldering. The standard female headers common to many Arduinos are preinstalled, as is the 2×3 male ISP header, 2×7 male LCD connector, buzzer, DC power jack, and shorting block headers for enabling the microSD hardware, buzzer, and battery voltage monitor. A removable8×2 character LCDis included with this configuration, and a preinstalled 2-pin terminal block provides an alternate way of supplying input power to the board. This is the LV version of the A-Star Prime, which operates from2 V to 16 V..

This newer version (ac03e) of the A-Star 32U4 Prime LV replaces theoriginal version (ac03b). The new version uses an improved 5 V regulator that can deliver more current and operates from 2 V to 16 V instead of 2.7 V to 11.8 V. The easiest way to distinguish between the two versions is via the silkscreen on the bottom side of the board, above and to the left of the Pololu logo, where the original version is labeledac03band the new version is labeledac03e.

The A-Star 32U4 Prime ships with a preloaded Arduino-compatible bootloader (which uses 4 KB of flash memory, leaving 28 KB available for the user program). We provide a software add-on that enables the board to be easily programmed from the Arduino environment and an Arduino library to make it easy to use the additional on-board hardware. The A-Star 32U4 has the same microcontroller and form factor as the Arduino Leonardo, and it runs at the same frequency, so we generally expect it to work with shields that are compatible with the Leonardo and similar boards. Note that the Prime has additional components and connection points, so you should make sure these do not physically interfere with any shield you are considering using. The following table shows how the Prime compares to the Leonardo and Uno:Microcontroller:ATmega328PATmega32U4ATmega32U4

This repository contains Arduino add-on files, Windows drivers, and bootloaders for the A-Star 328PB, A-Star 32U4, and the rest of our 32U4 family of boards.