mattgaidica

const ulp_insn_t ulp_program[] = {
  // Label to loop back to
  M_LABEL(1),

  // Read GPIO18 state (bit 28) via RTC_GPIO_IN_REG
  I_RD_REG(RTC_GPIO_IN_REG, RTC_GPIO_INDEX + RTC_GPIO_IN_NEXT_S, RTC_GPIO_INDEX + RTC_GPIO_IN_NEXT_S),

  // Check if GPIO18 is low (R0 < 1). If low, wake up the CPU.
  M_BL(2, 1),  // If R0 < 1 (i.e., if GPIO18 is low, branch to wakeup)

mattgaidica

const ulp_insn_t ulp_program[] = {
  // Initialize transition counter (R3 <- 0)
  I_MOVI(R3, 0),  // Set R3 to 0 (counter)
  I_MOVI(R2, 1),  // Set R2 to address RTC_SLOW_MEM[1]

  // Increment 1
  I_ADDI(R3, R3, 1),  // Increment R3 by 1
  I_ST(R3, R2, 0),    // Store R3 in RTC_SLOW_MEM[1]

  // Increment 2

mattgaidica

#define GPIO_SENSOR_PIN GPIO_NUM_18  // GPIO pin connected to the sensor
#define RTC_GPIO_INDEX 18            // Serial.println(rtc_io_number_get(GPIO_SENSOR_PIN));

#define LED_PIN GPIO_NUM_13
#define LED_GPIO_INDEX 13

const ulp_insn_t ulp_program[] = {
  // Main loop
  M_LABEL(1),

mattgaidica

// Example to enter deep sleep after 10 seconds and wake up with a GPIO pin
void setup() {
    // Initialize Serial for debugging
    Serial.begin(115200);
    delay(1000);  // Wait for the serial to initialize

    // Set GPIO pin for wakeup
    esp_sleep_enable_ext0_wakeup(GPIO_NUM_0, 0);  // Wake on low signal on GPIO 0

    // Start deep sleep

mattgaidica

% Parameters
num_points = 100; 
noise_level = 0.25;  % Adjust this value to control the amount of noise

% Generate x values
x_curve = linspace(0, 1, 1000);  % Generate 1000 points between 0 and 1
y_curve = log(1 + 99 * x_curve) / log(100);  % Compute y values for the curve

% Select 12 random points along the curve
indices = randperm(length(x_curve), num_points);

mattgaidica

% Neodymium magnet parameters
radius_mm = 10;      % Magnet radius in millimeters
thickness_mm = 3;    % Magnet thickness in millimeters
M = 1.0;             % Magnetization in A m (adjust this value)

% Conversion factor from Gauss to voltage change
gauss_to_voltage = 1.5 / 1000;

% Permeability of free space
mu0 = 4 * pi * 1e-7;

mattgaidica

<div class="is-content-justification-center" style="text-align:center">
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</div>

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mattgaidica

% Hargens et al. (1985) Figure 2 Recreation
xs = 30:10:70;
fitxs = 0:100;

% backed out from plot
loadCenter = [49,40,33,20,10];
loadErrorUpper = [50.5,42.5,38,25,12.5];
tensionCenter = [50,57,66,78,85];
tensionErrorUpper = [55,59,70,83,88];

mattgaidica

// CMSIS Math
#include "arm_math.h"
#include "arm_const_structs.h"
#define SIG_SAMPLES 1024
#define BLOCK_SIZE 32;

#include "SWAsignal.h"
static float32_t filtSignal[SIG_SAMPLES];

// FILTER

mattgaidica

extern float32_t inputSignal[SIG_SAMPLES] = { 2.09186630161801,
		2.17981806111224, 2.2458345331045, 2.20702098281261, 2.05451765784143,
		1.85916546584311, 1.7767591356537, 1.79267779175089, 1.85004295412198,
		1.82818508686074, 1.72760166685638, 1.54716102329878, 1.39328525785108,
		1.37279362871747, 1.37225304331087, 1.31022305067551, 1.21566162283513,
		1.24287644762541, 1.38510735478485, 1.60578710124569, 1.93459280511249,
		2.26110788479076, 2.43559114351632, 2.44546630752519, 2.37477587905096,
		2.14026122136909, 1.77405580991932, 1.36350765781611, 0.998258176086951,
		0.77357268824843, 0.567933484496516, 0.384275954063506,
		0.288059029461084, 0.311287985207322, 0.323805443624895,