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--- xnorit:public:summary:xnorduino [2024/10/13 10:36] – [Power monitoring] timdv91
+++ xnorit:public:summary:xnorduino [2026/03/08 14:09] (current) – timdv91
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 The termination brick power-consumption is extremely low, meaning that our 5V power-rail suffices as it's power source on even longer cable runs. The Bus-master reads an "heartbeat" from this termination brick in a 20 ms interval. The 24V power-rail gets enabled, whenever the termination brick is successfully detected by the master. The master disables the 24V power-rail within 50 ms, whenever the termination-brick gets disconnected. This feature functions fully automatically, without any human intervention.
-This feature was implemented, to prevent accidentally inserting 24V on standardized network equipment. Which could potentially cause damage on certain devices.
+This feature was implemented, to prevent accidentally inserting 24V on standardized network equipment. Which could potentially cause damage on certain devices. A red LED starts to blink on the master, whenever the termination module gets disconnected.
-Additionally, the termination brick measures temperature and the voltages of both power rails (as can be seen in the image underneath).
+Additionally, the termination brick measures temperature and the voltages of both power rails (as can be seen in the right image). A red LED starts to blink on the master, whenever the voltage drop across master and termination modules become to large.
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-Our 24V power-rail has a maximum current that depends on the utilized cat-cable. I therefore implemented a digital current-sense IC on the master, which disables the 24V power-rail pro-grammatically whenever our current draw surpasses a certain pre-configured value. For safety reasons, any over-current detection disables the 24V rail permanently, until human intervention resets the system.
+Our 24V power-rail has a maximum current that depends on the utilized cat-cable. I therefore implemented a digital current-sense IC on the master, which disables the 24V power-rail pro-grammatically whenever our current draw surpasses a certain pre-configured value. For safety reasons, any over-current detection disables the 24V rail permanently, until human intervention resets the system by clicking the "reset" button (visible in image at the right). A red LED will indicate the over-current trigger on the PCB itself.
 Additionally the power-monitor IC reads the 24V rail voltage at the beginning of the communication bus. The Termination-brick measures the 24V rail at the end of the bus, meaning we can calculate the voltage drop across our bus by subtracting these two.
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 Below are some (approved) example images of various slave devices.
+  * PWM Fan controller
+  * Current and voltage sense
+  * 16 bit ADC modules
+  * Humidity and temperature module
+  * Weather station module
+  * LED driver modules
+  * etc ...
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