TTL, voltage, one-wire test rig

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SUMMARY

The discussion centers on creating a test rig for environmental sensors connected to a data logger, specifically addressing issues with the MB7380 ultrasonic sensor operating on TTL. The proposed solutions include using a DSO203 Pocket-Sized Oscilloscope and the CY8CKIT-050 development kit for testing GPIO functionality. The importance of a user-friendly design for non-technical users is emphasized, along with the need for a Go/NoGo test set to verify sensor outputs against known good signals. Participants stress the necessity of understanding communication protocols and signal integrity for effective troubleshooting.

PREREQUISITES
  • Understanding of TTL signal standards and their applications
  • Familiarity with the MB7380 ultrasonic sensor specifications
  • Knowledge of GPIO pin configurations and their functionalities
  • Basic principles of signal integrity and communication protocols
NEXT STEPS
  • Research the functionality and applications of the CY8CKIT-050 development kit
  • Learn about the operation and features of the DSO203 Pocket-Sized Oscilloscope
  • Study the principles of signal termination and its impact on communication reliability
  • Explore methods for creating a Go/NoGo test set for sensor validation
USEFUL FOR

Electrical engineering students, hardware developers, and technicians involved in sensor integration and testing for environmental monitoring systems.

  • #31
adamaero said:
All I can find on the Q4 datalogger are instruction manuals, not datasheets.
Does it specify SPI datarates anywhere? Sorry if you already posted it and I missed it.
 
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  • #32
berkeman said:
Does it specify SPI datarates anywhere? Sorry if you already posted it and I missed it.
"6 GPIO pins and also contains a High Speed UART, SPI bus and I2C Bus"

"Includes 2X High Speed 3.3V (5V Tolerant) TTL Serial Ports, 1X High Speed SPI Interface, 1X I2C Interface with onboard pullups, 8X GPIO Pins"

I can ask the company for a numerical value.
  1. Is "high speed" is a specific value?
  2. Also, why SPI? Is this one SPI? Why isn't it UART?
  • GPIO5/UART2_RX/SPI_IN
 
  • #33
Yeah, asking the manufacturer might be a good idea, and also ask if there are any back-termination resistors included on their high-speed communication lines.
 
  • #34
Designing from the top, down;
After building a data logger you can plug in your 'test unit' to monitor functionality and QC.
In the field you can connect your 'test unit' to diagnose faults that may be present.

You will need to tap into each data logger's circuits in a number of places to check operation. That must be done without disturbing the unit under test. You could insert an extra plug&socket tap as a wedge between existing mated connectors. That would not be convenient with screw terminals.

The alternative would be to provide a standard external field test connector that gives access to the majority of internal connections on all the data loggers built. Your test unit can then evolve as further tests are developed during the manufacturing and testing phases.
 
  • #35
Baluncore said:
Designing from the top, down;
After building a data logger you can plug in your 'test unit' to monitor functionality and QC.
...
Yes, that's the easy part.

berkeman said:
... communication lines.
It's only a few feet. The site is remote, but powered by solar panels. Transmission line effects are negligible.
 

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