pslab-hardware

This repository contains the PSLab hardware design files. PSLab is a tiny pocket science lab that provides an array of test and measurement instruments for doing science and engineering experiments. It can function like an oscilloscope, waveform generator, frequency counter, programmable voltage and current source and also as a data logger. The first version of hardware (v1) was developed by Jithin. Later versions were developed by Padmal and Rafael.

PCB Layout

Front Side	Back Side

Pin-outs

Find the pin-out diagram of PSLab V6 here!

Applications and Firmware Source Repositories

The following software components are available:

Firmware: https://github.com/fossasia/pslab-firmware
Android app: https://github.com/fossasia/pslab-android
Desktop app: https://github.com/fossasia/pslab-desktop

Buy Device

You can get a Pocket Science Lab device from the FOSSASIA Shop.
More resellers are listed on the PSLab website.

Communication

Our chat channel is on Gitter here at PSLab
Mailing List https://groups.google.com/forum/#!forum/pslab-fossasia

Repository Structure

📦pslab-hardware
 ┣ 📂archives                                   # Source files for previous PSLab versions
 ┃ ┣ 📂Breakout_Boards
 ┃ ┣ 📂PSLab KiCAD
 ┃ ┣ 📂PSLab KiCAD v2
 ┃ ┗ 📂PSLab KiCAD v3
 ┣ 📂docs                                       # Supplementary material
 ┃ ┣ 📂components
 ┃ ┃ ┣ 📜BillOfMaterials.csv                    # Component list
 ┃ ┃ ┗ 📜InteractiveBoM.html                    # Interactive version of BoM
 ┃ ┣ 📂datasheets                               # PDF datasheets for components used in PSLab
 ┃ ┣ 📂drawings                                 # CAD dimension drawings
 ┃ ┣ 📂images
 ┃ ┃ ┣ 📂pslab_version_previews
 ┃ ┃ ┣ 📜 ...
 ┃ ┃ ┗ 📜PSLab_v6_top.png
 ┃ ┣ 📂pin_layouts                              # Pin labels and specifications
 ┃ ┃ ┣ 📜PSLab_Pin_Layout.pdf
 ┃ ┃ ┗ 📜PSLab_Pin_Layout.svg
 ┃ ┣ 📂position_files
 ┃ ┃ ┗ 📜PositionFile.csv                       # Pick and place information
 ┃ ┣ 📂reference                                # TeX documentation (stale)
 ┃ ┗ 📂schematics
 ┃ ┃ ┗ 📜PSLab.pdf                              # Board schematic in PDF
 ┣ 📂output
 ┃ ┣ 📂Gerber                                   # Gerber files for the current board design
 ┃ ┗ 📂Images                                   # Images of the four copper layers
 ┣ 📂print                                      # Silk screen images
 ┃ ┣ 📂Back-Side-Images
 ┃ ┗ 📜Readme.md
 ┗ 📂schematics                                 # KiCAD project files
   ┣ 📂3DModels                                 # STEP 3D models
   ┣ 📂PSLab.pretty                             # Custom library files
   ┣ 📜 ...
   ┗ 📜PSLab.pro                                # Main project file

Version Information

Version	Content	Preview
PSLab KiCAD v1	Original version with `SEELABLET` schematics and layout files
PSLab KiCAD v2	Developed version with new additions (Voltage regulator, Oscillator)
PSLab KiCAD v3	Device layout changed to Arduino Uno form factor
PSLab KiCAD v4	Assembly optimized version with Arduino Mega form factor having components mounted only on top side
PSLab KiCAD v5	Added socket for external bluetooth module and bottom silk screen with pin description
PSLab KiCAD v6	Added external power input, RTC module, SD Card slot, USB type C, ESP 01 and upgraded UART and power ICs

Platform

Microcontroller Platform : PIC24EP256GP204
IDE: MPLABX IDE v3.35 (Supported on Linux/Windows/Mac)
Compiler: MPLAB® XC16 Compiler
Programming Tool: PICkit™ 3 In-Circuit Debugger

Parts list

PIC24EP256GP204 - Microcontroller
MCP6S21 - Programmable gain amplifier
MCP4728 - 4 Channel DAC
TC7660 - Charge Pump voltage invertor
TC1240A - Charge Pump voltage doubler
TL082 - 2 channel Op-Amp
LM324 - 4 channel Op-Amp
DS1307Z+ - RTC module
LDFM33PUR - 3.3 V regulator
LDL212PU50R - 5.0 V regulator
CP2102N-A02-GQFN24 - USB-UART bridge
74HC126 - 4 channel buffer
SP0503BAHTG - ESD protector
0.5 A Fuse
Assorted resistors, capacitors & diodes

Find the complete bill of materials from this link.

Optional Parts

Extension slots for an ESP is available.

ESP8266 (ESP-01) - UART-TCP bridge

Hardware Specs

3-Channel up to 2MSPS Oscilloscope. Software selectable amplification stages
12-bit Voltmeter with programmable gain. Input ranges from +/-10 mV to +/-16 V
3x 12-bit Programmable voltage sources +/-3.3 V,+/-5V,0-3 V
12-bit Programmable current source. 0-3.3 mA
Supports Advanced plugins/Add-on Modules
4-Channel, 4 MHz Logic Analyzer
2x Sine/Triangular wave generators. 5 Hz to 5 KHz. Manual amplitude control for SI1
4x PWM generators. 15 nS resolution. Up to 8 MHz
Capacitance Measurement. pF to uF range
I2C, SPI and UART data buses for Accelerometer gyroscope humidity and temperature sensor modules etc

Feature list for the acquisition and control

Oscilloscopes

One of the main features of PSLab is the 3-channel Oscilloscope which can monitor analog inputs at maximum of 2 million samples per second. It includes controls such as triggering, and gain selection. Uses Python-Scipy for curve fitting.

Waveform Generators

SI1 : 5 Hz – 5 KHz arbitrary waveform generator. Manual amplitude control up to +/-3 Volts
SI2 : 5 Hz – 5 KHz arbitrary waveform generator. Amplitude of +/-3 Volts. Attenuable via software
SQx : There are four phase correlated PWM outputs with maximum frequency 32 MHz, 15 nano second duty cycle, and phase difference control.

Measurement Functions

Frequency counter tested up to 16 MHz.
Capacitance Measurement. pF to uF range
PSLab has several 12-bit analog inputs (function as voltmeters) with programmable gains, and maximum ranges varying from +/-5 mV to +/-16 V.

Voltage and Current Sources

12-bit Constant Current source. Maximum current 3.3 mA (subject to load resistance).
PSLab has three 12-bit Programmable voltage sources +/-3.3 V,+/-5 V,0-3 V. (PV1, PV2, PV3) controls

Other useful tools

4MHz, 4-channel Logic analyzer with 15 nS resolution. Voltage and current sources
SPI, I2C and UART outputs
Graphical Interfaces for Oscilloscope, Logic Analyser, streaming data and several experiments developed that use a common framework which drastically reduces code required to incorporate control and plotting widgets.
PSLab also has space for an ESP-01 module for WiFi access with access point/station mode.

fossasia / pslab-hardware

readme