Customer:
We need to test textile for light transmission. Here are our requirements:
Light sensor:
- Measurable wavelength: Visible light 400–750 nm (firm requirement), UV-light 250–400 nm (wish)
- Present spectrum (wish)
- Measurement accuracy (firm, consider both minimum and maximum values)
- Calibratable (wish)
- Measuring range (firm): midday sun 100,000–130,000 lux, cloudy sky approx. 100–20,000 lux
- Responsiveness < 60 s (firm)
- Multiple measuring points adapted to sample size (wish)
- Connection to data interface possible (wish)
- Evaluation electronically on PC (firm)
Temperature sensor:
- Measuring range 15°C–70°C (firm)
- Measurement accuracy ±1°C (firm)
- Measuring range −20°C–85°C (wish)
- Measurement accuracy ±0.1°C (wish)
- Responsiveness < 60 s (firm)
- Adapted to light sensor (firm)
- Measuring chamber temperature (firm)
- Measuring the temperature of the textile (wish)
- Calibratable (wish)
Attachment omitted in migration: image002.png
Attachment omitted in migration: image001.jpg
Originally submitted via email support on 12 February 2025. Migrated to the forum for community visibility.
Soldered Support:
The LTR-507 is our most detailed light sensor. It’s based on the LTR-507 chip.
Here is a comparison of your requirements against the LTR-507 specification:
| Requirement |
Your Specification |
LTR-507 Specification |
| Measurable Wavelength |
Visible light 400–750 nm (firm), UV-light 250–400 nm (wish) |
Close to human eye spectral response, Full Scale ADC Count: 0–65535 |
| Present Spectrum |
Wish |
Not explicitly stated |
| Measurement Accuracy |
Firm - Consider for both minimum and maximum values |
Dynamic range 1: 1 lux/count, Other ranges available |
| Calibratable |
Wish |
Not factory-calibrated, can be adjusted via software |
| Measuring Range |
Firm - In coordination with light source, midday sun 100,000–130,000 lux, cloudy sky approx. 100–20,000 lux |
1 to 64,000 lux (16-bit ADC) |
| Responsiveness |
Firm - < 60 s |
Typical wakeup time 10 ms, Initial startup 100 ms |
| Multiple Measuring Points |
Wish - Adapted to sample size |
Not natively supported |
| Connection to Data Interface |
Wish |
I2C Interface |
| Evaluation Electronically on PC |
Firm |
Requires microcontroller and software |
Note: The LTR-507 is a hobbyist-grade sensor and is not factory-calibrated. To interface with this sensor, you need an EasyC cable and a Dasduino running custom code, or an Arduino with the appropriate example code. Calibration is necessary to achieve accurate readings.