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Phototransistor cable for twilight detection
avrcandies wrote: some other generally worthwhile info: http://www.nutsvolts.com/magazine/article/light-sensitive-circuits I might use the circuit in Figure 14.d with an opamp in...
Tuesday, 11 April 2017 - 15:03
Phototransistor cable for twilight detection
avrcandies wrote: The varying leakage currents through the pin must be accounted for in your accuracy distribution.  If the ADC pin has a 0.5 uA  DC variance in leakage...
Tuesday, 11 April 2017 - 10:03
Phototransistor cable for twilight detection
Using this 20 cm (8 in) cable, should I put a small resistor - 10R - in series next to ADC input? Something like this:   3V----PH-T-----+--------------+------+  ...
Monday, 10 April 2017 - 10:32
Phototransistor cable for twilight detection
ka7ehk wrote: Having the capacitor greatly reduces the need for 10K or less source resistance... Jim Yes, I'm using the capacitor to avoid that problem. I guess the 10k or less,...
Monday, 10 April 2017 - 09:32
Phototransistor cable for twilight detection
El Tangas wrote: Yeah, there is not enough current to feed the sample capacitor for the ADC, unless you wait a long time between samples, so that capacitor CL has time to charge....
Monday, 10 April 2017 - 09:15
Phototransistor cable for twilight detection
awneil wrote: Why not just put a comparator or schmitt trigger at the sensor end to give you a simple digital signal to the micro ... ? I've thought about that too, bit I need to...
Friday, 7 April 2017 - 15:35
PCINT interrupt on level change with slow rising signal
MartinM57 wrote:How much current down your resistor divider compared with 100uA/0.6uA (with regards to a low power app)? Anyway, if your stuck with 3V/ms then you have plenty of...
Monday, 3 October 2011 - 17:08
PCINT interrupt on level change with slow rising signal
MartinM57 wrote:Ugh. MCP6002... Slew Rate: 0.6V/us MCP6002: supply current: 100uA MCP6044: supply current: 0.6uA Since this is low power, I must use the latter...
Monday, 3 October 2011 - 16:24
PCINT interrupt on level change with slow rising signal
Opamp: mcp6044 Slew rate: 3V/ms
Monday, 3 October 2011 - 15:06
PCINT interrupt on level change with slow rising signal
Yes, this is a drawing, but the signal is that clean, at least from what I see from the oscilloscope. The analog signal comes from an opamp used as an analog comparator: -the...
Monday, 3 October 2011 - 10:06
(Outdated) Script for building AVR-GCC 4.5.1 on Linux
Bingo600: I would like to use one of your build scripts (great work! by the way) and I want to build it all static. I want to be able to upgrade operating systems (kubuntu) and...
Friday, 15 April 2011 - 16:06
Atomic read/write to uint16_t variable
Wek, That's great, thanks! I'll try those macros!
Thursday, 4 November 2010 - 15:55

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