WC8 stable in hot weather
- Thread starter thac
- Start date
CAI_Support
Senior Member
Is this hw rev 2.2.2?
100 degrees F is only "warm" here. I've got boards working, outside, in enclosed boxes, in 43-45 deg C (113F), and according to the internal temperature monitors, frequently sitting around 130F.
(I seem to have more troubles with mine in low temperatures with high humidity.... but I *SUSPECT* that's something to do with I2C devices and the I2C bus locking up or going bonkers)
(I seem to have more troubles with mine in low temperatures with high humidity.... but I *SUSPECT* that's something to do with I2C devices and the I2C bus locking up or going bonkers)
one 2.2.2 and one 2.2.3 with the latest firmware. Both are in enclosed boxes with a small filtered hole on the bottom to keep bugs out. Usually the LCD display scrambles before it happens. With the small fans installed, they have been trouble free. I have to agree that high humidity probably plays a large part of the problem.
CAI_Support
Senior Member
@Thac,
WebControl HW revisions have 2.2.2 and 2.3.7 and 2.3.8. On hw rev 2.2.2 board, its voltage regulator can be pretty hot, adding a little heatsink for VGA or RAM on top of that LM2940S could help cooling off that regulator. On hw rev 2.3.7 and 2.3.8, they use switching power IC, so that they do not heat up. We have tested hw rev 2.3.x boards in up to 80C temperature range and still operate fine.
On some previously sold 2.3.7 and 2.3.8 boards, R20 was labeled 104 as 100K resistor. In all current shipping, that changed to 272, or 2.7K resistor. That is for helping 1-wire bus working more stable under hot temperature. If your board R20 labeled as 104, you can solder a little resistor from 1.8K to 5.1K on top of it. Even without that, 2.3.x boards are improved with its switcher IC to handle power.
WebControl HW revisions have 2.2.2 and 2.3.7 and 2.3.8. On hw rev 2.2.2 board, its voltage regulator can be pretty hot, adding a little heatsink for VGA or RAM on top of that LM2940S could help cooling off that regulator. On hw rev 2.3.7 and 2.3.8, they use switching power IC, so that they do not heat up. We have tested hw rev 2.3.x boards in up to 80C temperature range and still operate fine.
On some previously sold 2.3.7 and 2.3.8 boards, R20 was labeled 104 as 100K resistor. In all current shipping, that changed to 272, or 2.7K resistor. That is for helping 1-wire bus working more stable under hot temperature. If your board R20 labeled as 104, you can solder a little resistor from 1.8K to 5.1K on top of it. Even without that, 2.3.x boards are improved with its switcher IC to handle power.
