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April (issue #393) Circuit Cellar

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

[1] jetperch/jls—Performant data storage for huge, simultaneous, one-dimensional signals (

[2] jetperch/js220_evk1: Joulescope JS220 Evaluation Kit 1 (

[3] jetperch/pyjoulescope_ui: Joulescope UI source code (

[4] jetperch/pyjoulescope_examples: Python scripting and programming examples using the joulescope package (

Agilent Technologies |
DFRobot Electronics |
Espressif Systems |
Hewlett Packard |
Joulescope |
Raspberry Pi |

Code and Supporting Files

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

Altium |
Analog Devices |
Espressif Systems |
Hammond Manufacturing |
MIT App Inventor |
Wondom |

Fender Amplifiers:
Wondom APM2:
Analog Devices:
Altium Designer:

Code and Supporting Files

[1] Arduino webpage for downloading Arduino IDE 2.0.3:

[2] FreeRTOS for Arduino library GitHub repository:

[3] Liquid Crystal I2C Arduino library GitHub repository:

[4] FreeRTOS APIs, official documentation:

[5] The vTaskDelay() API, detailed discussion:

[6] The uxTaskGetStackHighWaterMark() API, detailed discussion:

FreeRTOS |

Code and Supporting Files

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

[1] AgSensor Solutions Inc – The current state of Sensor Development:

[2] Wheatstone Bridge:,which%20includes%20the%20unknown%20component

[3] Sensor Development page on Science Direct:

[4] Science Direct article on lactate monitoring:

[5] Honeywell Sensor Evaluation Kits:

[6] Arrow Sensor Development Boards:

[7] Rahman Spectroscopy:

AGD Consulting |
AgSensor Solutions |
Arrow |
HiTecSensors |
Honeywell |
Load Cells (Sensor Developments, Inc.) |
LogiSync |
Science Direct |
Sensor Development, Inc. |
Sensor Development International |
Spectral Sensor Solutions |

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

Analog Devices MAX32672:
Infineon XMC7200:
Microchip PIC32CXMTSH:
NXP Semiconductors LPC55S0x/LPC550x:
Renesas RA4E2:
Silicon Labs EFM32PG23:
STMicroelectronics STM32C031x4/x6:
Texas Instruments TMS320F28003x:
WCH CH32V003DS0:

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

[1] Quote From Littelfuse:,%2C%20under%20zero%20power%20conditions%22

[2] Thermistor from Adafruit:

Espressif |

Code and Supporting Files

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

Texas Instruments |
MikroElektronika |

TI TM4C1233H6PM product page:

Code and Supporting Files

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

[1] Overview of past and present RNAV:

[2] Horse idioms: see

[3] Wikipedia entry on HALT:

[4] “Fundamentals of HALT/HASS Testing” (PDF). Keithley Instruments, Inc. Cleveland, Ohio. 2000.:

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

[1] Comparison of audio coding formats:

[2] Article on “The Nyquist Frequency and Aliasing”:

[3] Wikipedia on ID3:

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

[5] MPEG Audio Compression Basics:

[6] How to play .mp3 files from SD via I2S:

Audacity |
Espressif |

Code and Supporting Files

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April (issue #393) Circuit Cellar

by Circuit Cellar Staff time to read: 4 min