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| Function : |
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The Astro-Clock is an Astronomic Programmable Timer that is used to Switch On and Off the Lighting Loads (e.g. Street Lights or Parking Zone Lighting, Premises Lighting ... etc ... ) according to Sunrise and Sunset times for that Site location, without a brightness detector (Photo Cell Sensor).
Sunrise and Sunsets times are calculated automatically for that 'Day of the Year' by the Astro-Clock according to the geographic parameters i.e. Latitude, Longitude and the Time Zone of the installation site defined by the user. |
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| Description : |
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The Astro-Clock is preconfigured configured at the factory level to the geographic parameters according to the Site Installation. |
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The Astro-Clock allows: |
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Switching operation (switch-on / switch-off) of Lighting Loads during the sunset and sunrise times calculated by the microcontroller. |
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Permanent display by LCD, 4 lines x 16 characters: |
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Real Time Clock Values like hours and minutes, day of the week, Date, Month, Year and also the Sunrise and Sunset times for the particular Site of Installation are displayed. |
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Astro-Clock has a dedicated Real Time Clock (RTC) Chip with a Lithium Battery for Back up for retention of Time setting in absence of power. RTC is clocked with independent crystal of Frequency: 32.768 KHz. |
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Manual Override Switch for Maintenance Task. |
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Astro-Clock is designed to work in harsh & demanding environments. All the required components for EMI / EMC protection are integrated in every section. ABS enclosure (Make : BOPLA) |
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Note : Absence of a brightness detector (Photocell Sensor) increases operation reliability and allows easier installation and maintenance. |
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Technical Data: |
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ATMEL's AVR Microcontroller: ATmega32 powerful- 8 Bit RISC processor |
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Power supply : 230 V AC ± 10% - 50 / 60 Hz |
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Relay Contacted to Supply line to operate contactor coil |
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Cylindrical Ferrites for Noise Suppression during Contactor Switching. |
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Switching accuracy : 1 second |
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Time accuracy: ± 1 second/month. |
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Saving time by lithium battery (CR 2032)
Retention lifetime : 10 years in absence of Power |
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Maximum capacity : 6 mm2
Posidriv 1 or flat 0.8 x 4 mm |
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Overall dimensions : 200mm X 120mm X 75 mm |
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Weight : 900g |
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Working Example : |
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The Astro-Clock will calculate the sunrise and sunset times and propose a default program operation i.e. switching operation (switch-off/switch-on) of Lighting Loads from sunset to sunrise. |
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For example : |
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• Location: Pune, Maharashtra.
• Geographical Position:
Latitude: North 18 deg. 32 min
Longitude: East 73 deg .52 min |
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| Pune |
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Date |
Sunrise |
Sunset |
1.1.10 |
7:07 |
18:09 |
1.4.10 |
6.29 |
18.48 |
1.7.10 |
6.02 |
19.15 |
1.10.10 |
6.25 |
18.23 |
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| Mumbai |
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Date |
Sunrise |
Sunset |
1.1.10 |
7:12 |
18:12 |
1.4.10 |
6.33 |
18.53 |
1.7.10 |
6.05 |
19.20 |
1.10.10 |
6.29 |
18.27 |
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| Hyderabad |
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Date |
Sunrise |
Sunset |
1.1.10 |
6.46 |
17.53 |
1.4.10 |
6.11 |
18.29 |
1.7.10 |
5.46 |
18.54 |
1.10.10 |
6.06 |
18.05 |
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Figure 01 : Illustrate the working of Relay in sync with Sunrise & Sunset |
