Hardware - ST Tracker
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Components:
Raspberry Pi 3 Mod A+:
Specifications:This single board computer was used because it offers good performances but it has reduced dimensions and power consumption compared to other models produced by the Raspberri Pi foundation.
- Broadcom BCM2837B0, Cortex-A53 (ARMv8) 64-bit SoC @ 1.4GHz
- 512MB LPDDR2 SDRAM
- 2.4GHz and 5GHz IEEE 802.11.b/g/n/ac wireless LAN
- 40 pin GPIO
- 5V/2.5A DC power input
- Dimensions: 65x56x6 mm
Raspi UPS HAT Board V1.1:
To power the system was used a device that connects directly to the GPIO head of the Raspberry Pi. This board is able to supply battery information via the I2C bus and takes care of the battery recharging process. To be able to charge the battery from the outside, a micro-USB extension cable was attached to a face of the solid.
Specifications:
- Lithium battery, 2600MAh capacity , 3.7V voltage
- 2A fast charge support
- 4 battery status LEDs
MPU-6050:
Specifications:Sensor that contains a 3-axis accelerometer and a gyroscope in an integrated circuit. It uses a standard I2C bus to communicate with the Raspberry Pi.
- 16 bit AD Converter
- Gyroscope measurement range: ±250, ±500, ±1000, 2000 °/s
- Accelerometer measurement range: +2, +4 , +8 , +16 g
- Power supply: 3V - 5V
RTC DS3231:
A RTC (Real Time Clock) module is used to keep the date and time up to date and memorized even when the device is turned off. The module is powered by a 3 volt CR2032 battery and communicates with the Raspberry Pi through an I2C bus.
Structure:
The octahedron, that contains the entire system, was obtained from a 4mm Plexiglass sheet. Each face measures 135mm and has been chamfered at 55° to make it match the adjacent one. The solid consists of two pyramids and has been equipped with magnets arranged to join the two parts in only one position. This allowed easy access inside the device in the prototype phase. To identify the activities, stickers with the corresponding numbers were applied on the faces of the octahedron.
Connections:
