Shunt and Burden Resistor

Shunt Resistor:

Purpose: To measure current directly flowing through a circuit.

Burden Resistor:

Purpose: To provide a load for the secondary winding of a current transformer (CT) and to convert the CT's output current into a measurable voltage.

Pull up and down resistor

motor-dat - motor-driver-dat

  • control the logic level of a signal line by ensuring that it is pulled to a known voltage level (high or low) when no active device is driving the line.

serial-dat

CRSF-dat serial communication is active low (the line stays High at 3.3V when idle or sending a '1' bit).

  1. The Problem: The ESP8266's internal pull-up resistors are too "weak" (10kΩ–50kΩ). At high speeds or over longer wires, they cannot pull the signal back up to 3.3V fast enough. This rounds off the sharp corners of the digital waves, causing corrupt data or a stream of zeros.
  2. The Fix: Adding a stronger external 1kΩ to 4.7kΩ resistor forces the voltage to snap back to 3.3V instantly. This sharpens the digital edges, allowing SoftwareSerial to read the data packets accurately.

Wiring:

  • Connect one leg of a 1kΩ resistor to the ESP8266 RX pin (GPIO12).
  • Connect the other leg to the 3.3V pin on the ESP8266.

Surface-Mount Resistor Sizes and Power Ratings

Package Dimensions (inch) Dimensions (mm) Typical Power Rating
R0201 0.02 × 0.01 0.6 × 0.3 0.05 W (1/20 W)
R0402 0.04 × 0.02 1.0 × 0.5 0.063 W (1/16 W)
R0603 0.06 × 0.03 1.6 × 0.8 0.10 W (1/10 W)
R0805 0.08 × 0.05 2.0 × 1.25 0.125 W (1/8 W)
R1206 0.12 × 0.06 3.2 × 1.6 0.25 W (1/4 W)
R1210 0.12 × 0.10 3.2 × 2.5 0.5 W
R2010 0.20 × 0.10 5.0 × 2.5 0.75 W
R2512 0.25 × 0.12 6.3 × 3.2 1.0 W
R4527 0.45 × 0.27 11.5 × 6.8 2.0 W – 3.0 W

EIA-96 SMD Resistor Code Chart (1% Precision)

  • 30E == 2000K
  • 30D == 200K
  • 01C = 10K
  • 01D = 100K
  • 85C = 85K
  • 124 = 120K
  • 163 = 16K
  • 393 = 39K

Multiplier Letters

Letter Multiplier
Z ×0.001
Y / R ×0.01
X / S ×0.1
A ×1
B ×10
C ×100
D ×1,000
E ×10,000
F ×100,000

Base Values (01–96)

Code Value Code Value Code Value Code Value
01 100 25 178 49 316 73 562
02 102 26 182 50 324 74 576
03 105 27 187 51 332 75 590
04 107 28 191 52 340 76 604
05 110 29 196 53 348 77 619
06 113 30 200 54 357 78 634
07 115 31 205 55 365 79 649
08 118 32 210 56 374 80 665
09 121 33 215 57 383 81 681
10 124 34 221 58 392 82 698
11 127 35 226 59 402 83 715
12 130 36 232 60 412 84 732
13 133 37 237 61 422 85 750
14 137 38 243 62 432 86 768
15 140 39 249 63 442 87 787
16 143 40 255 64 453 88 806
17 147 41 261 65 464 89 825
18 150 42 267 66 475 90 845
19 154 43 274 67 487 91 866
20 158 44 280 68 499 92 887
21 162 45 287 69 511 93 909
22 165 46 294 70 523 94 931
23 169 47 301 71 536 95 953
24 174 48 309 72 549 96 976

E96

1% # 1% # 1% # 1% # 1% # 1% #
10.0 01 14.7 17 21.5 33 31.6 49 46.4 65 68.1 81
10.2 02 15.0 18 22.1 34 32.4 50 47.5 66 69.8 82
10.5 03 15.4 19 22.6 35 33.2 51 48.7 67 71.5 83
10.7 04 15.8 20 23.2 36 34.0 52 49.9 68 73.2 84
11.0 05 16.2 21 23.7 37 34.8 53 51.1 69 75.0 85
11.3 06 16.5 22 24.3 38 35.7 54 52.3 70 76.8 86
11.5 07 16.9 23 24.9 39 36.5 55 53.6 71 78.7 87
11.8 08 17.4 24 25.5 40 37.4 56 54.9 72 80.6 88
12.1 09 17.8 25 26.1 41 38.3 57 56.2 73 82.5 89
12.4 10 18.2 26 26.7 42 39.2 58 57.6 74 84.5 90
12.7 11 18.7 27 27.4 43 40.2 59 59.0 75 86.6 91
13.0 12 19.1 28 28.0 44 41.2 60 60.4 76 88.7 92
13.3 13 19.6 29 28.7 45 42.2 61 61.9 77 90.9 93
13.7 14 20.0 30 29.4 46 43.2 62 63.4 78 93.1 94
14.0 15 20.5 31 30.1 47 44.2 63 64.9 79 95.3 95
14.3 16 21.0 32 30.9 48 45.3 64 66.5 80 97.6 96

C = 1K

  • 30C = 20K

R0805 1% 1K ~ 20 MΩ

  • 1kΩ - 1.02kΩ - 1.05kΩ - 1.1kΩ - 1.15kΩ - 1.2kΩ - 1.21kΩ - 1.24kΩ - 1.27kΩ - 1.3kΩ - 1.33kΩ - 1.4kΩ - 1.43kΩ - 1.47kΩ - 1.5kΩ - 1.6kΩ - 1.62kΩ - 1.65kΩ - 1.69kΩ - 1.74kΩ - 1.8kΩ - 1.82kΩ - 1.87kΩ - 1.91kΩ
  • 2kΩ - 2.05kΩ - 2.1kΩ - 2.15kΩ - 2.2kΩ - 2.21kΩ - 2.32kΩ - 2.37kΩ - 2.4kΩ - 2.43kΩ - 2.49kΩ - 2.55kΩ - 2.61kΩ - 2.67kΩ - 2.7kΩ - 2.74kΩ - 2.8kΩ - 2.87kΩ - 2.94kΩ
  • 3kΩ - 3.01kΩ - 3.09kΩ - 3.16kΩ - 3.24kΩ - 3.3kΩ - 3.32kΩ - 3.4kΩ - 3.48kΩ - 3.6kΩ - 3.65kΩ - 3.74kΩ - 3.83kΩ - 3.9kΩ - 3.92kΩ
  • 4.02kΩ - 4.12kΩ - 4.22kΩ - 4.3kΩ - 4.32kΩ - 4.42kΩ - 4.53kΩ - 4.64kΩ - 4.7kΩ - 4.75kΩ - 4.87kΩ - 4.99kΩ
  • 5.1kΩ - 5.11kΩ - 5.36kΩ - 5.49kΩ - 5.6kΩ - 5.76kΩ - 5.9kΩ
  • 6.04kΩ - 6.19kΩ - 6.2kΩ - 6.34kΩ - 6.49kΩ - 6.65kΩ - 6.8kΩ - 6.81kΩ - 6.98kΩ
  • 7.5kΩ - 7.68kΩ - 7.87kΩ
  • 8.06kΩ - 8.2kΩ - 8.45kΩ - 8.66kΩ - 8.87kΩ
  • 9.09kΩ - 9.1kΩ - 9.31kΩ - 9.53kΩ - 9.76kΩ
  • 10kΩ - 10.2kΩ - 10.5kΩ - 10.7kΩ - 11kΩ - 11.8kΩ - 12kΩ - 12.1kΩ - 12.4kΩ - 13kΩ - 13.3kΩ - 14kΩ - 14.3kΩ - 14.7kΩ - 15kΩ - 15.4kΩ - 16kΩ - 16.2kΩ - 16.5kΩ - 16.9kΩ - 17.4kΩ - 18kΩ - 18.2kΩ - 18.7kΩ - 19.1kΩ
  • 20kΩ - 21kΩ - 21.5kΩ - 22kΩ - 22.1kΩ - 22.6kΩ - 23.7kΩ - 24kΩ - 24.3kΩ - 24.9kΩ - 25.5kΩ - 26.7kΩ - 27kΩ - 27.4kΩ - 28kΩ - 28.7kΩ - 29.4kΩ
  • 30kΩ - 30.1kΩ - 30.9kΩ - 31.6kΩ - 32.4kΩ - 33kΩ - 33.2kΩ - 36kΩ - 36.5kΩ - 37.4kΩ - 38.3kΩ - 39kΩ - 39.2kΩ
  • 40.2kΩ - 41.2kΩ - 42.2kΩ - 43kΩ - 43.2kΩ - 44.2kΩ - 45.3kΩ - 47kΩ - 47.5kΩ - 48.7kΩ - 49.9kΩ
  • 51kΩ - 51.1kΩ - 52.3kΩ - 53.6kΩ - 54.9kΩ - 56kΩ - 56.2kΩ - 59kΩ
  • 60.4kΩ - 62kΩ - 63.4kΩ - 66.5kΩ - 68kΩ - 68.1kΩ - 69.8kΩ
  • 73.2kΩ - 75kΩ - 78.7kΩ
  • 80.6kΩ - 82kΩ - 82.5kΩ - 86.6kΩ - 88.7kΩ
  • 90.9kΩ - 91kΩ - 93.1kΩ - 95.3kΩ - 97.6kΩ
  • 100kΩ - 102kΩ - 105kΩ - 110kΩ - 118kΩ - 120kΩ - 121kΩ - 124kΩ - 130kΩ - 133kΩ - 140kΩ - 147kΩ - 150kΩ - 160kΩ - 162kΩ - 169kΩ - 174kΩ - 180kΩ - 182kΩ - 187kΩ - 191kΩ - 196kΩ
  • 200kΩ - 210kΩ - 215kΩ - 220kΩ - 221kΩ - 232kΩ - 237kΩ - 240kΩ - 243kΩ - 249kΩ - 270kΩ - 274kΩ - 280kΩ - 287kΩ - 294kΩ
  • 300kΩ - 301kΩ - 316kΩ - 330kΩ - 332kΩ - 360kΩ - 365kΩ - 383kΩ - 390kΩ - 392kΩ
  • 430kΩ - 453kΩ - 470kΩ - 475kΩ - 487kΩ - 499kΩ
  • 510kΩ - 511kΩ - 523kΩ - 536kΩ - 549kΩ - 560kΩ - 576kΩ
  • 604kΩ - 620kΩ - 680kΩ - 681kΩ - 732kΩ - 750kΩ - 768kΩ - 806kΩ - 820kΩ - 845kΩ - 910kΩ
  • 1MΩ - 1.1MΩ - 1.2MΩ - 1.3MΩ - 1.5MΩ - 1.6MΩ - 1.8MΩ - 2MΩ - 2.2MΩ - 2.4MΩ - 2.7MΩ - 3MΩ - 3.3MΩ - 3.6MΩ - 3.9MΩ - 4.3MΩ - 4.7MΩ

  • 5.1MΩ - 5.6MΩ - 6.2MΩ - 6.8MΩ - 7.5MΩ - 8.2MΩ - 9.1MΩ - 10MΩ - 12MΩ - 15MΩ - 20MΩ

  • resistor-feedback-dat

ref

Table of Contents

https://www.electrodragon.com