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2 layers95.3 × 61 mmKrit, the printed circuit board in 3D

Work done during kritsnam

Size
95.3 × 61 mm
Copper layers
2
Thickness
1.6 mm
Parts
15
Nets
44
Pads
91
Tracks, vias
134, 24
Routed
Yes
KiCad
KiCad 4
Created
1 Jun 2018
Updated
26 Jul 2018

Overview

Krit is an open-source printed circuit board by bsahil, from the bsahil/Kritsnam repository on GitHub. It is a 2-layer board of 95.3 × 61 mm with 15 parts on 44 nets, routed with 134 tracks and 24 vias.

It is built around the DS18B20. It belongs with the ESP32 boards of this library.

Main components

1

README

README.md

Kritsnam

This Readme File along with the Internship Report combined is supposed to act as the overall Internship Report, as asked of me by my Internship supervisor.

Work done during kritsnam
  1. Communication with ESP32 using micropython.

    • Complete setup of I2C and UART protocol with ESP32 flashing both Micropython and Arduino one by one.
    • Sent and received data using these protocols with different sensors of interests, including Temperature, Soil Moisture and Dissolved Oxygen sensors by Atlas Scientific.
  2. Overall understanding and testing of all ESP32 board functionalities.

    • Operation of ESP32 using WIFI, Bluetooth module embedded onboard.
    • Sent and received data to and from an online open source server facility provided by Thingsboard.
    • Integration of data from different sensors and sending it to Thingsboard server to view and utilize data on cloud from anywhere where data connectivity is available.
  3. Completed Device Prototype by mid-June.

    • Prototype was up and functioning with ‘4’ i2c-sensors and one “one-wire” temperature sensor “ds18b20” attached to it.
  4. Undertook PCB designing for the actual product.

    • Used Kicad for PCB-designing.
    • Learnt PCB-designing for a week.
    • Made custom libraries of schematic and footprints for the project by the end of June. Libraries available here.
    • Completed Footprint and Schematic of PCB by 5th of July.
    • Sent PCB to printing.
  5. Turbidity sensor work

    • Calibration of the sensor was done.
    • Wrote python code for data collection and calibration of the sensor using ESP32-lite.

Parts

15
QtyValueFootprintReferences
4Atlas-Sensorfootprint:atlas-sensorU9, U10, U11, U12
4EZOfootprint:ezoU5, U6, U7, U8
34.7KResistors_SMD:R_0603Resistor1, Resistor2, Resistor3
2I2C-separatorfootprint:i2c-isolatorU3, U4
1DS18b20footprint:ds18b20U1
1ESP32-litefootprint:esp32-liteU2

Questions

How big is the Krit PCB?

It measures 95.3 × 61 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Krit use?

15 parts, built around the DS18B20. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Krit KiCad files?

From the bsahil/Kritsnam repository on GitHub, at the commit this page was made from: the board is PCB-Design/pcb/krit.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Krit design in my own project?

Its repository states no licence, so its author keeps all rights: ask bsahil before reusing the design.

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