Eval » Historie » Version 12
Maximilian Seesslen, 21.04.2023 11:32
| 1 | 1 | Maximilian Seesslen | h1. Eval |
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| 2 | |||
| 3 | h1. Overall design |
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| 4 | |||
| 5 | * 4 x red+green LEDs for condition |
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| 6 | * Restart button |
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| 7 | 10 | Maximilian Seesslen | * Iterate over the ADC channels and get Voltage level |
| 8 | 4 | Maximilian Seesslen | * draw 100mA |
| 9 | * Die Kabel haben AWG28, 212.9 Ohm/km, 1.4 A nach erde, 0.23 A versorgung |
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| 10 | 7 | Maximilian Seesslen | * 0,2129 Ohm/m; 1,0645 Ohm/5m; 2,129 Ohm/10m; |
| 11 | 4 | Maximilian Seesslen | * https://de.wikipedia.org/wiki/E-Reihe#/media/Datei:E12_values_graph.svg |
| 12 | 9 | Maximilian Seesslen | * Buzzer would be nice for indication; durchklingeln |
| 13 | * PWM Output |
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| 14 | 11 | Maximilian Seesslen | * Pinsocket connected to wires to measure resistance/Voltage directly |
| 15 | 4 | Maximilian Seesslen | |
| 16 | 12 | Maximilian Seesslen | h1. Calculations I |
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| 18 | 4 | Maximilian Seesslen | U2=((U*R2)/R_GES) |
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| 20 | 5 | Maximilian Seesslen | U |
| 21 | 4 | Maximilian Seesslen | R*I |
| 22 | |||
| 23 | 5V/0,1A= 50 Ohm |
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| 24 | 5V*0,1A= 0,5 W |
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| 25 | |||
| 26 | 7 | Maximilian Seesslen | 5V/0,5A= 10 Ohm |
| 27 | |||
| 28 | 4 | Maximilian Seesslen | RGes = R1+R2 = 50 |
| 29 | 1 | Maximilian Seesslen | |
| 30 | 3V=(5*R2)/50 |
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| 31 | 12 | Maximilian Seesslen | *R2 = (3*50)/5 = 30 -> 27 |
| 32 | R1 = 22* |
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| 33 | 5 | Maximilian Seesslen | RGES = 49 |
| 34 | |||
| 35 | U2 = 5*27/49 = 2,755102 |
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| 36 | 7 | Maximilian Seesslen | |
| 37 | theoretically an device that draws 0,1A and 5m: |
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| 38 | U2=((5*50)/ (50+1,0645) ) = 4,8957691; that should work |
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| 39 | |||
| 40 | 1 | Maximilian Seesslen | theoretically an device that draws 0,5A and 10m: |
| 41 | U2 = ( (5*10) / (10+2,129) ) = 4,1223514 V |
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| 42 | 12 | Maximilian Seesslen | |
| 43 | h1. Calculations II |
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| 44 | |||
| 45 | * Ein Kabel >= 10m soll durchfallen. Koennen trotzdem groessere Wiederstaende verwendet werden? |
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| 48 | 10 | Maximilian Seesslen | |
| 49 | h1. Keyfeatures |
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| 50 | |||
| 51 | * Cable checker |
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| 52 | * Buzzer Durchgangspruefer |
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| 53 | * PWM Output |
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| 54 | 7 | Maximilian Seesslen | |
| 55 | 1 | Maximilian Seesslen | h1. MCU |
| 56 | 2 | Maximilian Seesslen | |
| 57 | * "stm32f051c4":https://www.mouser.de/datasheet/2/389/stm32f051c4-1851079.pdf |
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| 58 | ** I have 17; |
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| 59 | 3 | Maximilian Seesslen | ** 16 ADC channels |
| 60 | 1 | Maximilian Seesslen | * STM32G030C8T6 |
| 61 | 6 | Maximilian Seesslen | ** nearly same specs but smaller footprint; LQFP 48 |
| 62 | 8 | Maximilian Seesslen | ** 2,68€ inc. Mwst. |