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interfaces:adda [2016/03/13 06:50] darron [Resources] |
interfaces:adda [2016/03/30 20:40] (current) darron |
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| The YL-40 is a cheap analogue I/O device based on the PCF8591 I2C interface chip. | The YL-40 is a cheap analogue I/O device based on the PCF8591 I2C interface chip. | ||
| + | There is at least one variant of this board not named YL-40 on but instead named | ||
| + | QiFEi on the reverse. | ||
| These devices combine the silicon chip with a potentiometer, | These devices combine the silicon chip with a potentiometer, | ||
| thermistor and two LEDs. | thermistor and two LEDs. | ||
| - | I have three of these devices, in two the earth connection to the thermistor is missing | + | I have three YL-40 devices |
| on the PCB, with this fault the NTC (channel 1) will always return a value of 255. | on the PCB, with this fault the NTC (channel 1) will always return a value of 255. | ||
| === Pinout === | === Pinout === | ||
| Line 35: | Line 37: | ||
| found. | found. | ||
| - | ^Board ^LDR @ 10lx ^NTC @ 25'C ^ Earth fault ^ Jumpers | | + | ^Board |
| - | |1 | + | |YL-40 #1| 10K | 4K7 / 3977 | No | RED |
| - | |2 | + | |YL-40 #2| 5K | 6K8 / 3977 | Yes | BLACK | |
| - | |3 | + | |YL-40 #3| 10K | 10K / 3977 | Yes | NONE |
| + | |QiFEi | ||
| - | As we can see, the components vary. | + | As we can see, the components vary, plus there is a massive variation |
| + | in response for the LDRs and they may be considered unique. | ||
| - | The LDRs are likely to be the GL/PGM 5516 (5K) and 5528 (10K). | + | The LDRs are likely to be the GL/PGM 5516 (~5K) and 5528 (~10K). |
| === PCF8591 === | === PCF8591 === | ||
