Try removing the "D" from these pin definitions.
I think you have alternating motors backwards. One side needs "LOW/HIGH" on the motor pins while the alternate side needs "HIGH/LOW."
sketch.ino
// define MCU pin IDs
// motor A
#define PIN_ENA1_1 12
#define PIN_IN1_1 11
#define PIN_IN2_1 10
// motor B
#define PIN_ENA2_1 9
#define PIN_IN3_1 8
#define PIN_IN4_1 7
// motor C
#define PIN_ENA1_2 6
#define PIN_IN1_2 5
#define PIN_IN2_2 4
// motor D
#define PIN_ENA2_2 3
#define PIN_IN3_2 2
#define PIN_IN4_2 13
#define MOTMIN 128
void setup() {
pinMode(PIN_IN1_1, OUTPUT);
pinMode(PIN_IN2_1, OUTPUT);
pinMode(PIN_ENA1_1, OUTPUT);
pinMode(PIN_IN3_1, OUTPUT);
pinMode(PIN_IN4_1, OUTPUT);
pinMode(PIN_ENA2_1, OUTPUT);
pinMode(PIN_IN1_2, OUTPUT);
pinMode(PIN_IN2_2, OUTPUT);
pinMode(PIN_ENA1_2, OUTPUT);
pinMode(PIN_IN3_2, OUTPUT);
pinMode(PIN_IN4_2, OUTPUT);
pinMode(PIN_ENA2_2, OUTPUT);
}
void loop() {
// MOTOR A
digitalWrite(PIN_IN1_1, HIGH);
digitalWrite(PIN_IN2_1, LOW);
analogWrite(PIN_ENA1_1, MOTMIN); // A, BL; motor A moves when zero
// // MOTOR B
digitalWrite(PIN_IN3_1, LOW);
digitalWrite(PIN_IN4_1, HIGH); // A
analogWrite(PIN_ENA2_1, MOTMIN); // A; motor A immobile when zero
// // MOTOR C
digitalWrite(PIN_IN1_2, LOW);
digitalWrite(PIN_IN2_2, HIGH); // BL
analogWrite(PIN_ENA1_2, MOTMIN); // BL
// // MOTOR D
digitalWrite(PIN_IN3_2, HIGH);
digitalWrite(PIN_IN4_2, LOW);
analogWrite(PIN_ENA2_2, MOTMIN);
}
diagram.json
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