For the Solar Challenge I created a prototype of a prototype - a data logger that records the ambient noise level (in volts) wherever it's located.
The project consists of the following elements:
- Solar panel
- LiIon battery (3.7V 2500mAh)
- LiIon/LiPoly USB charger
- Arduino Uno
- Sparkfun microSD shield
- 8GB microSD card
- Various USB adapters
I am getting upwards of 8V from the solar panel in moderate sun. The entire system seems to only be drawing around 40mA. I suspect this is because the Arduino Uno draws about 40mA and the microSD shield draws a negligible amount in comparison.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgC7EwyAkCbKztwr_-YCkVBfgdaB9M9QA8_wrido9lck3k_ZkLZjUhkRqmxLrfelPyx10H8MRC2_v-pXgp-T4Q18TkdD04xHUebFlvGtPM1WUAlUTPfoeHqwnLw1cbz53iQxd-lnF4wquGM/s1600/IMG_3157.JPG) |
Testing the panel + battery + charger |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSODBWBhd3ce_U1YwEuh6A5WQRpVjPbck0JalHr3WXpuP9XFswIWeOFHpOXzID2ek5AtBaDP7VCZxUsPJb6beeKDDSnV5tVxUlseKTiw0tpY3WvbxjPQ5llP7yqYHjftd0I9j-u51gDhzQ/s1600/IMG_3160.JPG) |
Close-up of microSD shield |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8XcuJZsuVkWhozGcRtdBiWmrpcA4azwKXh0pT-6xPiGPWNegphNRs5M9ENrKQXi1ApNSs7vqnYhEm7t6JnokSKav6YNKIuNGVXjsBsj8hRNtAQkNitdIY7WMp3qT9CngSclcJCM0Cm1J7/s1600/IMG_3164.JPG) |
Panel in a bag for weather protection |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqTGTT5S3DAsP_ZsHlvesG17w86oQL9hvxFNtUc5btYE9RLxuhC2iWNw_V073Jk1wz6vpu_UGC3oKh45ahy6gjnu8F_B6W0wQkdEvTdaJdXVFK0auVFSh8ALLGr9pGkobtzaakwZ8DJ3c5/s1600/IMG_3165.JPG) |
Action shot - on window ledge gathering sun + data |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJUBuFOtwhrn_awdwG1XRiLQHoyzNN9mWedEt9tEyt1mK6AV1T3_rkqXxsD3z6MXYKaYBP9w9EOtILh_SLfkJCTWjYcKo4Ri2cPiufJGUwG6wenNfDz77J2sHvh59lR6_uT9RixCTX_m5r/s1600/IMG_3170.JPG) |
Consolidated package using found surveillance mount |
Data is written to the microSD card every 200ms - a timestamp of milliseconds since startup and a reading from the electret microphone in volts. My latest test was foiled because the microSD card got wet and stopped logging shortly after startup, but I was able to get a solid chunk of real data last week and this is presented below.
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