Recent content by fwd03

Thanks, Ross. If I have ground from the point of inverter to connect to the ground of DC/DC 5V inverter, then have WebControl ground also connected to that point, with inverting amplifier, I could measure the current/voltage drop from each panel back to the point of ground. I think that will...

Ross, I am impressed with your setup.

Ross, You mentioned that you monitor your solar panel output by using WebControl. Could you please provide more details? I am trying to monitor my solar panel output also. I want to be able to compare them for effeciency, or any panel developed bad cell in it. I don't use battery and charger...

The main concern is not the counter weight, it is wind. When gusty winds getting to 50 MPH or higher, it puts tremendous force on the mount. Roof mount avoided that issue by letting roof obsorbing that force. However, roof mount does not produce most power with same amount of solar panels. In...

From web interface, do you see VAR4 change to 1 then back to 0? It seems only sending one email, even temperature going back up above 80.0 then coming back down, it will no longer send.

It must be a bug of the new firmware. Which version is that?

Or you can solder a 62K resistor on top R26, R28, and R30 to make the analog inputs range 0-5V.

Please share with us your meat thermometer probe result. Do you need to connect that through Ross' terminal board with op amp?

Oven sensor, which is heat senstive resistor, probably could stand smoker temperature. I have a GE oven, which allows to attach a food temp sensor to it inside the oven, to measure food temperature. Searching on eBay you will see a lot of them. You will probably need to have a resistor...

Ross, ADG1612 spec says its on resistence is 1 Ohm. Depending on what do you measure, if measuring voltage, there is not much current, so the on resistence would not make much difference anyway. For example, the ADC input after modify to 5V full scale, its input resistence is still 46K or so...

I tried DS2450 before, the value is all over the places. That might be the reason Maxim-IC stopped making it.

Brave, You are correct. Without external power, 5V powered op amp will only get close to 3.5V range anyway. Ross, If you are off grid, using a 5V DC/DC converter to replace the on board LM2940S could allow you use 12V or higher power supply without too much energy loss on the regulator. I am...

I think Ross wanted to keep using the existing 16 pin header. Solder one SMD resistor on top of another is not that hard, just make sure do one end first, then next end.

if 3.3V across 91K , the current is 3.626e-5A. If you want to have 5V full scale, then 5-3.3=1.7V. V/I = R, so 1.7V / 3.626e-5A = 46.879K 1/(1/200K + 1/Rx )= 46.879K Rx = 61.231K 62K resistor is probably the most closed one. http://www.ebay.com/itm/251074889117

When the board had no connection, was the green LED still blinking? If that is still blinking, then the problem maybe crystal frequency shift under cold weather. Microchip spec for its processor is -40C to +70C. I doube your temperature range is beyond that. However, crystal may shift its...