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April (issue #393) Circuit Cellar

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4: Joulescope JS220: A Precision DC Energy Analyzer, By Brian Millier

REFERENCES
[1] jetperch/jls—Performant data storage for huge, simultaneous, one-dimensional signals (github.com): https://github.com/jetperch/jls/tree/dc6770f36c62d167d2953dc7ee0f9b322dc97e8a

[2] jetperch/js220_evk1: Joulescope JS220 Evaluation Kit 1 (github.com): https://github.com/jetperch/js220_evk1

[3] jetperch/pyjoulescope_ui: Joulescope UI source code (github.com): https://github.com/jetperch/pyjoulescope_ui

[4] jetperch/pyjoulescope_examples: Python scripting and programming examples using the joulescope package (github.com): https://github.com/jetperch/pyjoulescope_examples

RESOURCES
Agilent Technologies | www.agilent.com
DFRobot Electronics | www.dfrobot.com
Espressif Systems | www.espressif.com
Hewlett Packard | www.hp.com
Joulescope | www.joulescope.com
Raspberry Pi | www.raspberrypi.com

Code and Supporting Files


14: Vintage-Style Tube Amplifier for Musicians: Built Using an ADAU1701 Audio System Chip and ESP32 MCU, By Avian Marinakis

RESOURCES
Altium | www.altium.com
Analog Devices | www.analog.com
Espressif Systems | www.espressif.com
Hammond Manufacturing | www.hammfg.com
MIT App Inventor | appinventor.mit.edu
Wondom | store.sure-electronics.com

SOURCES
Fender Amplifiers: https://www.fender.com/en-US/guitar-amplifiers/
Wondom APM2: https://store.sure-electronics.com/product/AA-AP23122
ADAU1701: https://www.analog.com/en/products/adau1701.html
SigmaStudio:  https://www.analog.com/en/design-center/evaluation-hardware-and-software/software/ss_sigst_02.html
Audacity: https://www.audacityteam.org/
Analog Devices: https://www.analog.com/en/index.html
ESP32: https://www.espressif.com/en/products/socs/esp32
Altium Designer: https://www.altium.com/altium-designer

Code and Supporting Files


REFERENCES
[1] Arduino webpage for downloading Arduino IDE 2.0.3: https://www.arduino.cc/en/software

[2] FreeRTOS for Arduino library GitHub repository: https://github.com/feilipu/Arduino_FreeRTOS_Library/archive/refs/heads/master.zip

[3] Liquid Crystal I2C Arduino library GitHub repository: https://github.com/johnrickman/LiquidCrystal_I2C/archive/refs/heads/master.zip

[4] FreeRTOS APIs, official documentation: https://www.freertos.org/a00106.html

[5] The vTaskDelay() API, detailed discussion: https://www.freertos.org/a00127.html

[6] The uxTaskGetStackHighWaterMark() API, detailed discussion: https://www.freertos.org/uxTaskGetStackHighWaterMark.html

RESOURCES
FreeRTOS | www.freertos.org

Code and Supporting Files


28: TECHNOLOGY FEATURE: Sensors: Integration and Development, By Michael Lynes

REFERENCES
[1] AgSensor Solutions Inc – The current state of Sensor Development: https://www.agsensorsolutions.com/the-current-state-of-sensor-development

[2] Wheatstone Bridge: https://en.wikipedia.org/wiki/Wheatstone_bridge#:~:text=A%20Wheatstone%20bridge%20is%20an,which%20includes%20the%20unknown%20component

[3] Sensor Development page on Science Direct: https://www.sciencedirect.com/topics/earth-and-planetary-sciences/sensor-development

[4] Science Direct article on lactate monitoring: https://www.sciencedirect.com/science/article/abs/pii/S1572665722003307

[5] Honeywell Sensor Evaluation Kits: https://sps.honeywell.com/us/en/products/advanced-sensing-technologies/healthcare-sensing/sensor-evaluation-kits/sensor-evaluation-kits

[6] Arrow Sensor Development Boards: https://www.arrow.com/en/research-and-events/articles/highlighting-5-unique-sensor-development-boards

[7] Rahman Spectroscopy: https://www.s-3llc.com/uv-raman.html

RESOURCES
AGD Consulting | www.agdconsult.com
AgSensor Solutions | www.agsensorsolutions.com
Arrow | www.arrow.com
HiTecSensors | hitec.humaneticsgroup.com
Honeywell | sps.honeywell.com
Load Cells (Sensor Developments, Inc.) | www.load-cells.org
LogiSync | www.logisync.com
Science Direct | www.sciencedirect.com
Sensor Development, Inc. | www.sensordev.com
Sensor Development International | www.sdinternational.nl
Spectral Sensor Solutions | www.s-3llc.com


34: DATASHEET: 32-Bit Microcontrollers: Chips That Won’t Stop Evolving, By Sam Wallace

Analog Devices MAX32672: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX32672.pdf
Infineon XMC7200: https://www.infineon.com/dgdl/Infineon-XMC-7200-Datasheet-DataSheet-v01_00-EN.pdf?fileId=8ac78c8c8412f8d30184443173374425
Microchip PIC32CXMTSH: https://ww1.microchip.com/downloads/aemDocuments/documents/SE/ProductDocuments/DataSheets/PIC32CXMTSH-Data-Sheet-DS60001770.pdf
NXP Semiconductors LPC55S0x/LPC550x: https://www.nxp.com/docs/en/data-sheet/LPC55S0x_LPC550x_DS.pdf
Renesas RA4E2: www.renesas.com
Silicon Labs EFM32PG23: https://www.silabs.com/documents/public/data-sheets/efm32pg23-datasheet.pdf
STMicroelectronics STM32C031x4/x6: https://www.st.com/resource/en/datasheet/stm32c031.pdf
Texas Instruments TMS320F28003x: https://www.ti.com/lit/ds/symlink/tms320f280037.pdf?ts=1677057458082
WCH CH32V003DS0: http://www.wch-ic.com/downloads/CH32V003DS0_PDF.html


38: THE MAGIC SMOKE FACTORY: Thermistors: Sensitive Resistors to Measure Temperature, By Joseph Corleto

REFERENCES
[1] Quote From Littelfuse: https://www.littelfuse.com/technical-resources/technical-centers/temperature-sensors/thermistor-info/thermistor-terminology/thermal-time-constant.aspx#:~:text=The%20technical%20definition%20of%20Thermal,%2C%20under%20zero%20power%20conditions%22

[2] Thermistor from Adafruit: https://www.adafruit.com/product/372

RESOURCES
Espressif | www.espressif.com

Code and Supporting Files


43: START TO FINISH: Biometrics: How Do I Know You Are Who You Say You Are?, By Stuart Ball

RESOURCES
Texas Instruments | www.ti.com
MikroElektronika | www.mikroe.com

SOURCES
TI TM4C1233H6PM product page: https://www.ti.com/product/TM4C1233H6PM

Code and Supporting Files


48: EMBEDDED IN THIN SLICES: Debugging Embedded Real-Time Systems: Strategies for Duplicating Bugs, By Bob Japenga

RESOURCES
[1] Overview of past and present RNAV: https://www.icao.int/WACAF/Documents/Meetings/2014/OPS-Approval/14%20October%202014/01%20-%20Introduction%20to%20RNAV.pdf

[2] Horse idioms: see https://horseyhooves.com/horse-idioms/

[3] Wikipedia entry on HALT: https://en.wikipedia.org/wiki/Highly_accelerated_life_test

[4] “Fundamentals of HALT/HASS Testing” (PDF). Keithley Instruments, Inc. Cleveland, Ohio. 2000.: https://download.tek.com/document/HALT_HASS_WP.pdf


52: FROM THE BENCH: Digital Audio Files: Replacing a Proprietary Format, By Jeff Bachiochi

REFERENCES
[1] Comparison of audio coding formats: https://en.wikipedia.org/wiki/Comparison_of_audio_coding_formats

[2] Article on “The Nyquist Frequency and Aliasing”: https://cmtext.indiana.edu/digital_audio/chapter5_nyquist.php

[3] Wikipedia on ID3: https://en.wikipedia.org/wiki/ID3

[4] Free hex editor (with time-limited structure viewer feature that will identify .mp3 tags and frames): https://www.hhdsoftware.com/

[5] MPEG Audio Compression Basics: http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm

[6] How to play .mp3 files from SD via I2S: https://github.com/schreibfaul1/ESP32-audioI2S

RESOURCES
Audacity | www.audacityteam.org
Espressif | www.espressif.com

Code and Supporting Files

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April (issue #393) Circuit Cellar

by Circuit Cellar Staff time to read: 4 min