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. 2020 Jun 2;20(11):3150. doi: 10.3390/s20113150

Figure 1.

Figure 1

Schematic representation of the low-cost and automatic phenotyping platform. The platform consists of the following electronical components: (a) data acquisition module with (a1) 2 AA batteries, (a2) a quartz crystal oscillator (16 MHz), (a3) 2 micro-USB connectors for weight and humidity sensors, (a4) a NRF24L01 transceiver module (2.4 GHz; Nordic Semiconductor®, Trondheim, Norway), (a5) 4 capacitors (two 22 pF, one 470 pF and one 1 uF), (a6) 2 voltage regulators 78xxl (1 mic5205-3.3y and 1 mic5205-5.0y; Micrel®, San Jose, CA, USA), (a7) a BME280 temperature, humidity and pressure sensor (Digi-Key®, Thief River Falls, MN, USA), (a8) a RTC, and (a9) a MCU ATmega328P_PU. (b) Data logger module with (b1) an SD card reader, (b2) a NRF24L01 transceiver module (2.4 GHz), (b3) 2 Arduino Nano V3.0, (b4) a RTC, (b5) 4 470 pF capacitors, (b6) 2 voltage regulators 78xxl (mic5205-5.0y), (b7) photographic camera module, and (b8) a 4N35 optocoupler (Mouser Electronics®, Solsona, Barcelona, Spain). (c) Engine control module with (c1) stepper motor (400 steps), (c2) a voltage regulator 78xxl (mic5205-5.0y), (c3) 2 470 pF capacitors, (c4) 4 switches (1 for direction and 3 for micro-steps control), (c5) engine enable unit based on Boolean logic, and (c6) driver DRV8825 (Texas Instruments Incorporated®, Dallas, TX, USA).