Representation of the designed miniaturized colorimeters: (A) the 1st model with a single LED and wired communication, (B) the 2nd model with 3 LEDs and wired communication, (C) the 3rd model with 3 LEDs and wireless communication capability, (D) a wiring diagram of the designed instrument (drawn using Fritzing); (1) a two-euro coin for scale comparison, (2) a 3D printed frame, (3) LEDs, (4) an NRF24L01+ wireless communication module, (5) a cuvette with the sample, (6) a USB wire, (7) communication wires, (8) a cover, (9) an Arduino Nano microcontroller board, (10) a TCS3200 light sensor module

Contexts in source publication

Context 1

... the development of the instrument 3 models were made (Fig. 1). The first model was equipped with a LED of a single wavelength and wired (USB cable) connectivity, the second model was upgraded with 3 different colour LEDs, and the third model, together with the above-men- tioned upgrades, had a possibility of wireless com- munication using an NRF24L01+ wireless trans- mitter (Nordic ...

Context 2

... a light sensor, a commu- nication module and a power supply (purchased from the local store). The LEDs (red 650 nm, green 520 nm and blue 470 nm (Vishay Semiconduc- tors, USA)) were purchased from the local store. A miniaturized colorimeter frame was 3D printed from ABS plastic using a PrintrBot 3D printer (PrintrBot, USA). In the 1st model (Fig. 1A) all electronic modules were placed outside the frame, that holds the cuvette, and the LED was sealed us- ing black hot glue. In the frames of the 2nd and 3rd models special positions were printed, so that the Arduino Nano microcontroller, the TCS3200 light sensor module, the NRF24L01+ wireless communication module and the wires would ...