squawk
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squawk [2016-10-10 15:54] – rob | squawk [2016-10-11 16:11] – rob | ||
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- | ====== Audio Alerts ====== | + | ====== Audio Alerts |
Traditionally this was handled by doorpi. However, that pi has too much stuff hanging off it, and was very out of date. There was an issue of a loud pop occurring before any sound played, this was fixed in later firmware updates. Rob has now dedicated a pi (original B) for the purpose and documents it thus: | Traditionally this was handled by doorpi. However, that pi has too much stuff hanging off it, and was very out of date. There was an issue of a loud pop occurring before any sound played, this was fixed in later firmware updates. Rob has now dedicated a pi (original B) for the purpose and documents it thus: | ||
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Text-to-speech message (with a clear airport/ | Text-to-speech message (with a clear airport/ | ||
< | < | ||
- | mosquitto_pub -h mqtt -t ' | + | mosquitto_pub -h mqtt -t ' |
</ | </ | ||
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There are four speakers connected, two per channel, located in each of the rooms on the ceiling. The speakers are 8 Ohm moisture resistant cheap ceiling speakers that have exceeded expectations and produce a surprisingly full sound. This opens up the potential for using them for background music in the future (e.g. via MPD). | There are four speakers connected, two per channel, located in each of the rooms on the ceiling. The speakers are 8 Ohm moisture resistant cheap ceiling speakers that have exceeded expectations and produce a surprisingly full sound. This opens up the potential for using them for background music in the future (e.g. via MPD). | ||
+ | |||
+ | ==== Raspberry Pi ==== | ||
+ | |||
+ | Standard pi other than having some wires soldered on the underside of the board to connect to the 3.5mm audio jack. Powered via the header rather than USB. | ||
+ | |||
+ | ==== Amplifier ==== | ||
+ | |||
+ | * TPA3116 | ||
+ | * "100 W" | ||
+ | * 12-24v (more volts = more power) | ||
+ | * Volume pot | ||
+ | * 3-pin header input or 3.5mm socket | ||
+ | |||
+ | Audio is input via the 3-pin header. | ||
+ | |||
+ | Power is input on the centre screw terminal, with left and right speaker outputs either side. | ||
==== Power Supply ==== | ==== Power Supply ==== |
squawk.txt · Last modified: 2023-11-25 23:45 by jaso55555