modupm
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====== Modifying UPM Base unit ====== | ====== Modifying UPM Base unit ====== | ||
- | UPM manufacurs | + | UPM manufactures |
- | The protocol sent from the sensors is actually a digital protocol which is AM decoded over 433.92MHz radio signal. The bit rate of the protocol is slow enough to be sampled by the microphone input of a regular PC, so this is the interface we use. All wee need is to find the decoded radio signal, adapt the level and feed it into the microphone input. The NetHome software does the rest. | + | The protocol sent from the sensors is actually a digital protocol which is AM decoded over 433.92MHz radio signal. The bit rate of the protocol is slow enough to be sampled by the microphone input of a regular PC, so this is the interface we use. All we need is to find the decoded radio signal, adapt the level and feed it into the microphone input. The NetHome software does the rest. |
+ | |||
+ | ===== Modifying hardware ===== | ||
When we open the base unit, we see that UPM has made it easy for us, the radio receiver unit is a separate card (down to the left) where the decoded radio signal is avaliable! There are only three wires connected to the radio board, Power, Ground and signal output. The signal is the decoded digital signal pulses from the transmitters! | When we open the base unit, we see that UPM has made it easy for us, the radio receiver unit is a separate card (down to the left) where the decoded radio signal is avaliable! There are only three wires connected to the radio board, Power, Ground and signal output. The signal is the decoded digital signal pulses from the transmitters! | ||
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{{ : | {{ : | ||
- | The curcuit | + | The circuit |
{{ : | {{ : | ||
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Now we have a nice computer interface to the UPM-Unit. | Now we have a nice computer interface to the UPM-Unit. | ||
- | There are some things to note regarding the placement of the base unit. The radio receiver is quite sensitive to interfearence, so you should place it at least two meters away from the computer or other RF emitting equipment (WLAN transmitter an such things). You may also have to put a ferrite bead on the cabel close to the UPM-Unit to block high frequency | + | ===== Connecting ===== |
+ | |||
+ | There are some things to note regarding the placement of the base unit. The radio receiver is quite sensitive to interference, so you should place it at least two meters away from the computer or other RF emitting equipment (WLAN transmitter an such things). You may also have to put a ferrite bead on the cable close to the UPM-Unit to block high frequency | ||
+ | |||
+ | ===== Microphone settings ===== | ||
+ | |||
+ | The microphone input should be set on highest input " | ||
+ | |||
+ | In windows this is done from the control panel under sound settings. | ||
+ | In Linux this is done with the program alsamixer. Start alsamixer from a command prompt (//sudo alsamixer// | ||
modupm.1235567926.txt.gz · Last modified: 2018/11/03 02:57 (external edit)