silvio biasiolThis is a table with the main power consumption that I will have. I'm planning to use a camera and image recognition, in addition to the sonar, to build a simple but effective obstacle avoidance system.
component | power mW | utilization % (estimation) |
Arduino UNO/micro | 5v * 25mA/50mA = 125mW/250mW if active) 5v * 4mA = 20mW (sleep mode and hardware modifications) | 80-90% |
HRXL‑MaxSonar (ultrasonic rangefinder) | 3.3v * 3.1mA = 10.23mW | 40% |
IMU (inertial measurement unit) * 2 | 3.3v * 145-350µA = 0.725mW/1.75mW each | 100% |
GPS unit | 3.3V * 30mA = 99mW (average) 3.3V * 12mA = 39.6mW (for the antenna) | 10% |
DYMOND D 47 Servo (for the rudder) | 5V * 250mA = 1250mW | 50% |
SW5513-4MA Sailwinch Servo (for the sail) | 5V * 110-350mA = 550mW/1750mW | ?? |
So the total power consumption should be around:
1750mW + 1250mW * ½ + (39.6mW + 99mW) * 1/10 + 1.75mW * 2 + 10.23mW * ¼ + 250mW * 4/5 ≅ 2594.91mW ≅ 2.595W
An eolic vertical turbine with an efficency of 35% (a round down estimate from average efficency), diameter of 10cm, height of 50cm and a wind speed of 7m/s c.a. (based on the average wind speed in Italy) should produce c.a. 3.230W (source: http://www.windstuff.org/calc/calc.php)
If, in addition, I use 4 solar panels 85x115mm of 18V and 100mA I should get:
18V * (100mA * 4) ≅ 7.200mW = 7.2W and supposing an efficency of 40% (day/night, circuit losess, water, dust, etc..) I should get c.a. 2.88W
These are just estimations of course! Please feel free to correct me if I've said something wrong :)
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