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May (issue #406) Circuit Cellar

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4: IoT Desk Controller: Using a Raspberry Pi Pico, By Chris Cantrell

Adafruit |
ExpressPCB |
Raspberry Pi |

[1] 5V Mechanical Relay:
[2] TLP592A Solid State Relay:
[3] Biplane CircuitPython web server:
[4] HC-SR04 Ultrasonic Sonar Distance Sensor:
[5] 2-key Mechanical Keyboard:
[6] Tiny Blue LEDs:
[7] Adafruit PN532 NFC/RFID board:
[8] Adafruit RFID/NFC Smart Ring:
[9] Suresh Joachim:

PCB Mount Screw Terminals:


Code and Supporting Files

10: Build a Monitor for Houseplants: Using an Arduino UNO, Sensors, and Wireless RF Transmission, By Andrei Florian

Arduino |

[1] “Indoor Plants Market Size—Global Industry, Share, Analysis, Trends and Forecast 2023-2032”—Acumen Research and Consulting:
[2] “The Best Air Purifying Plants, According to NASA”—
[3] “The Most Surprising Houseplant Statistics and Trends in 2024”—Gitnux:
[4] “Why plants in the office make us more productive”—ScienceDaily:
[5] “Gen Z Houseplant Ownership Stems from the Desire to Care for Something Alive”—Civic Science:
[6] Soil Moisture Sensor Hookup Guide: Instructions for calibrating the soil moisture: sensor:*28xabh*_ga*OTg2MjM1NjY3LjE3MDYwMjI4OTE.*_ga_T369JS7J9N*MTcwNjMzNjkzOS4yLjEuMTcwNjMzNzAzNy42MC4wLjA.&_ga=2.179748900.1440378636.1706336939-986235667.1706022891
[7] Arduino IDE:
[8] Arduino extension available for Visual Studio Code:
[9] Guide for installing third-party libraries:
[10] VirtualWire, Liu Song—GitHub:
[11] Wire, Arduino—GitHub:
[12] LiquidCrystal_I2C, Frank de Brabander—GitHub:
[13] dht, Dhruba Saha—GitHub:

Code and Supporting Files

18: Video Game Inspired by The Legend of Zelda: Implemented on a Raspberry Pi Pico MCU, By Tangia Sun, Emily Speckhals, and Max Klugherz

Raspberry Pi |

[1] Wikipedia: The Legend of Zelda (Video Game):
[2] Framework for VGA driver developed by V. Hunter Adams and Bruce Land:
[3] Adam Dunkels, “Protothreads”:
[4} Cornell University, “ ECE4760, ProtoThreads, PIC32MX250F128B”:
[5] Video demonstration of the completed project:

Adams, “ECE 4760/5730, Cornell University,”, 2023
Raspberry Pi Ltd, “RP2040 Datasheet,” 2023
Raspberry Pi Ltd, “Raspberry Pi Pico Datasheet,” 2023

Code and Supporting Files

24: TECHNOLOGY FEATURE: Artificial Intelligence: For Fitness and Health Aids, By Michael Lynes

AI Wellness |
Apple | |
CliniScripts |
Doctronic |
Google Health |
Masimo |
Mendora AI |

[1] The Ultimate Guide to Health and Fitness Tech for 2024:
[2] Medium:,use%20of%20this%20powerful%20technology.
[3] AI ContentFY:
[4] NLM Smart Devices for Health and Wellness… :
[5] Hey Abby example video:
[6] Mendora Free Trial:
[7] Google Health—The Check Up:
[8] Google Health AI Diagnostics: India –
[9] 16.   Johnson&Johnson:*MTcwNTQxNTIzMS4xLjEuMTcwNTQxNTI3OS4xMi4wLjA.&_ga=2.205332377.841604605.1705415231-1250245443.1705415231
[14] Kaleido:
[15] Thor Arm video:
[16] Improve human-robot collaboration with GhostAR—Arduino:
[17] Tesla Optimus demo video:
[18] HydraNet Tesla:
[10] J&J MedTech – MONARCH Robotic Assisted Bronchoscopy:
[11] Humanity App:

“The Wizard of OZ” –
L. Frank Baum:
“Wonderful Wizard of Oz, The”
“The Wonderful Wizard of Oz” – play:
“The Wiz” – play:
“Wicked” – play:
AI Wellness Mirror®:

30: DATASHEET: IoT Modules: A Multitude of Connectivity Solutions, By Sam Wallace

Ezurio Sera NX040 Series:
Infineon CYW20822-P4xxI040:
Globalscale Technologies GTI-ATM3330e:
Morse Micro MM6108-MF08651-US:
Panasonic PAN1780:
Renesas DA16600:
Qorvo QPM2101:
u-blox ANNA-B112:

34: EMBEDDED SYSTEM ESSENTIALS: Touching the Unknown With JTAG, By Colin O’Flynn 

NewAE Technology |
NXP Semiconductors |

[1] Colin O’Flynn, “EMBEDDED SYSTEM ESSENTIALS: Bringing JTAG Boundary Scan into 2021: A Relic Reloaded.” Circuit Cellar 370, May 2021, pp. 60-65.
[2] PyJtag Boundary Scan project:
[3] Colin O’Flynn, “EMBEDDED SYSTEM ESSENTIALS: Building the ChipWhisperer-Husky: Upgraded Design.” Circuit Cellar 376, November 2021, pp. 56-58.
[4] Colin O’Flynn, “EMBEDDED SYSTEM ESSENTIALS: Low-Level Automotive ECU Security: Vehicle Vulnerabilities.” Circuit Cellar 364, November 2020, pp. 56-59.
[5] Freescale/NXP MPC5676RRM , “MPC5676R Microcontroller Reference Manual”:
[6] Freescale/NXP App Note AN4365, “Qorivva MPC56xx Flash Programming Through Nexus/JTAG”:
[7] GITHub companion repository (source code posted here):

Code and Supporting Files

40: PICKING UP MIXED SIGNALS: Smoke Alarm Monitoring: With an ESP32, By Brian Millier

[1] Brian Millier, “GUI-O: A “Virtual” Front Panel For ESP32 Projects.” Circuit Cellar 389, December 2022.
[2] App Inventor Particle Photon Test on GitHub:
[3] Brian Millier, “PICKING UP MIXED SIGNALS: Particle IoT Platform Update: Part 1.” Circuit Cellar 402, January 2024.
[4] DFRobot ESP32-C3 Beetle module (DFR0868):
[5] DFRobot DFR0478 FireBeetle:
[6] Pulse Electronics W3334B0100 External Bluetooth Antenna:
[7] Particle Tools—Particle Docs:
[8] Brian Millier, “PICKING UP MIXED SIGNALS: Easing into the IoT Cloud (Part 2): Modules in Action.” Circuit Cellar 342, January 2019.

ESP32 M5Stamp PICO: Digi-Key Part Number 2221-K051-ND
SPH0645LM4H I2S Microphone breakout board: Adafruit product ID 3241
Battery Boost Module/charger module:

Adafruit |
Espressif Systems |
Knowles |
Prowl |

Code and Supporting Files

48: FROM THE BENCH: Lighting a Miniature Holiday Village: Part 2: It Takes Custom Lighting to Make a Village, By Jeff Bachiochi

Espressif Systems |

[1]  Jeff Bachiochi, “FROM THE BENCH: Lighting a Miniature Holiday Village: Part 1: Using DotStar RGB LEDs with an ESP8266 & WEMOS-D1 Mini.” Circuit Cellar 405, April 2024, p. 50.
[2] – World’s largest web developer site:
[3]  Microsoft Expression Web 4 is no longer supported, but still great:
[4] How HTML has evolved is discussed in W3C Wiki:

Wemos D1 mini ESP8266:
DotStar LEDs:

Code and Supporting Files

63: TECH THE FUTURE: The Future of Wireless Communication: Chip Antennas: Redefining Wireless Connectivity, By Shalini Nagar

Research Nester |

“Chip Antenna Market Size & Share, by Product Type”—Research Nester:

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May (issue #406) Circuit Cellar

by Circuit Cellar Staff time to read: 6 min