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Development board for the collection of physical variables

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termoDaQ

Header

termoDaQ is a development board based on the Arduino architecture, uses an ATmega328-P and an ATtiny85 for its operation.

This board was originally designed to help the work of oceanography students, serving as an instrument for the acquisition of physical variables (temperature, pressure) at surface level in bodies of fresh water, in order to detect changes that may affect the flora or fauna of ecosystems, automating the work of making measurements over time.

But it can serve many purposes since it has a connection for GPS receivers, pressure sensor, multiple temperature sensors (internal and external), two additional inputs for any analog sensor (such as rain, flow or UV) and SD card.

The function of the ATtiny85 is work as a timer to program the operation cycles of the equipment, reducing the energy consumption, which allows incrementing the operation time when the battery is used. To achieve this, activate and deactivate the sensors area.

The function of the ATmega328-P is to control the sensors area, managing each of them to perform the measurement and data storage processes.

Operation

Operation

The board is divided into three parts

  1. Power supply.
  2. Energy management.
  3. Sensors area.

In particular, I'm responsible for developing the energy management and the sensors area.

For the energy management, is used the ATtiny85 microcontroller to carry out cycles that enable or disable the sensors, cutting off the power in periods where no measurements are needed.

As for the sensors area, its function is to perform the measurements and store the data. Only one cycle at a time, at the end one signal is sent to the energy management area to cut the power.

Pinout

Pinout

Board specifications

All the source files are in this repository

  • Board Size: 99.82 mm X 73.41 mm (X = 99.82, Y = 73.41)
  • Number of layers: 2
  • Number of drills: 311
  • Number of vias: 47
  • Number of signals: 146
  • Minimum copper trace width: 0.41 mm
  • Consumption: ~ 80mAh (currently under test)

Overall

ATtiny85

Name Value
Operating Voltage Range (V) 1.8 to 5.5
Temperature Range (C) -40 to 85
CPU Speed (MIPS/DMIPS) 20
Pin Count 8
Program Memory Type Flash
Program Memory Size (KB) 8
SRAM Bytes 512
Data EEPROM/HEF (bytes) 512
Digital Communication Peripherals 1-SPI, 1-I2C
Capture/Compare/PWM Peripherals 5PWM
Timers 2 x 8-bit
Number of Comparators 1

ATmega328P

Name Value
Operating Supply Voltage 1.8 V to 5.5 V
Temperature Range (C) - 40 to 85
Maximum Clock Frequency 20 MHz
Pin count 28
Number of I/Os 23 I/O
Program Memory Type Flash
Program Memory Size 32 kB
Data Bus Width 8 bit
Data RAM Type SRAM
Data RAM Size 2 kB
Data ROM Type EEPROM
Data ROM Size 1 kB
Number of ADC Channels 6
ADC Resolution 10 bit
Interface Type I2C, SPI, USART
Number of Timers/Counters 3 Timer

Translation

English translation using google translator.

If you wish, you can help me translate the readme file correctly.

License

Creative Commons Attribution-ShareAlike 4.0 International Public License

Please go to the License section for more information. Link

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