10-channel thermistor-based temperature logger with display and SD card - improvements

TL;DR

The video discusses enhancements to a temperature logger, focusing on improved display and voltage divider configurations.

Transcript

this video is sponsored by pcba welcome everyone in this video I'm going to show you some improvements for my 10 Channel temperature logger circuit so in my previous video I showed you this guy here I designed this and put it together and this is a NTC thermistor based temperature logger and how it works is that it uses this microcontrollers all of... Read More

Key Insights

• 👤 The design upgrades for the temperature logger focused heavily on enhancing the user interface while improving circuit accuracy.
• 😘 Resistor value selection in voltage dividers can significantly impact the device's performance, especially at lower temperature ranges.
• 👤 The implementation of a well-characterized user interface helps users better interpret temperature data.
• ☠️ Real-time logging onto an SD card allows for efficient data management and retrieval for further analysis.
• 🏣 The importance of experimenting with different configurations was highlighted, emphasizing the need for thorough testing post-upgrade.
• 👤 Iterative design improvements demonstrate how user feedback can guide hardware adjustments, improving overall functionality.
• 🎮 The video emphasizes the value of sponsorships in funding electronics projects, bringing attention to community support avenues.

Questions & Answers

Q: What are the main improvements made to the temperature logger circuit?

The main improvements include a new display for better readability and aesthetics, as well as changes to the voltage divider's resistor configurations. By using multiple values of resistors, specifically ranging from 10k Ohm to 220k Ohm, the system achieves improved linearity and accuracy, especially for lower temperature readings.

Q: How does the voltage divider work in the temperature logger circuit?

The voltage divider consists of a fixed resistor and an NTC thermistor. The output voltage from this setup is proportional to the temperature, allowing the microcontroller’s ADC to read temperature values. Different resistor values are chosen to shift the measurement range and improve sensitivity, particularly towards negative temperature ranges.

Q: What was the purpose of the experiments conducted with the new temperature logger?

The experiments aimed to test the functionality and accuracy of the upgraded temperature logger. Various temperature sources, including ice water and a thermoelectric cooler, were used to observe how the logger accurately measures and displays temperature changes in real time under different conditions.

Q: What coding aspects were updated alongside the hardware improvements?

The coding updates included functions to handle temperature conversions, manage the data logging process on an SD card, and enhance user interface navigation. Specific codes were also provided to support various temperature units (Celsius, Fahrenheit, Kelvin) and address the management of display outputs related to temperature readings.

Summary & Key Takeaways

• The video details improvements made to a previously designed 10-channel temperature logger using NTC thermistors, outlining changes to both display and circuit functionality.

• A new, more visually appealing display was implemented alongside modifications to voltage divider resistors to enhance measurement accuracy, particularly at lower temperatures.

• Experimental testing showcased the upgraded temperature logger's performance, including live readings in various temperature scenarios and data logging capabilities onto an SD card.