From 7ca8256b2911ca311690d95695ce727544a8034b Mon Sep 17 00:00:00 2001
From: Dave Astels <dastels@daveastels.com>
Date: Fri, 26 Oct 2018 16:58:21 -0400
Subject: [PATCH] BalanceBot code and STLs

---
 BalanceBot/code.py           |  213 +
 BalanceBot/m3-thumbwheel.stl | 8906 ++++++++++++++++++++++++++++++++++
 BalanceBot/servomount.stl    |  Bin 0 -> 26084 bytes
 3 files changed, 9119 insertions(+)
 create mode 100644 BalanceBot/code.py
 create mode 100644 BalanceBot/m3-thumbwheel.stl
 create mode 100644 BalanceBot/servomount.stl

diff --git a/BalanceBot/code.py b/BalanceBot/code.py
new file mode 100644
index 000000000..182470463
--- /dev/null
+++ b/BalanceBot/code.py
@@ -0,0 +1,213 @@
+"""
+Self balancing 2 wheeled bot using a PID controller.
+See https://en.wikipedia.org/wiki/PID_controller
+
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+
+Written by Dave Astels for Adafruit Industries
+Copyright (c) 2018 Adafruit Industries
+Licensed under the MIT license.
+
+All text above must be included in any redistribution.
+"""
+
+
+import busio
+import board
+import time
+import array
+import math
+from adafruit_seesaw.seesaw import Seesaw
+from adafruit_seesaw.pwmout import PWMOut
+from adafruit_motor import servo
+from digitalio import DigitalInOut, Direction
+import adafruit_lsm9ds0
+
+# Parameters
+SAMPLE_INTERVAL = 0.02
+ACCEL_ZERO_ADJUST = 0.25
+
+SERVO1_ZERO_ADJUST = -0.015
+SERVO2_ZERO_ADJUST = -0.015
+
+# Tilt signal LED
+led = DigitalInOut(board.D13)
+led.direction = Direction.OUTPUT
+led.value = False
+
+# i@c: accelerometer and CRICKIT
+i2c = busio.I2C(board.SCL, board.SDA)
+sensor = adafruit_lsm9ds0.LSM9DS0_I2C(i2c)
+seesaw = Seesaw(i2c)
+
+# UART
+uart = busio.UART(board.TX, board.RX, baudrate=115200)
+
+# Servos
+pwm1 = PWMOut(seesaw, 17)
+pwm1.frequency = 50
+servo1 = servo.ContinuousServo(pwm1, min_pulse=500, max_pulse=2500)
+
+pwm2 = PWMOut(seesaw, 16)
+pwm2.frequency = 50
+servo2 = servo.ContinuousServo(pwm2, min_pulse=500, max_pulse=2500)
+
+# Stop the servos
+servo1.throttle = SERVO1_ZERO_ADJUST
+servo2.throttle = SERVO2_ZERO_ADJUST
+
+
+# A line was received via the UART, process it
+
+def process_command(cmd, kp, ki, kd):
+    """Process a command line from the UART.
+    cmd is the list of bytes received via the UART
+    kp, ki, and kd are the current constant values
+    Returns new constant values (unchanged in the cases of an error)
+    """
+
+
+    def report(kp, ki, kd):
+        """Inner function to write the constants to the UART"""
+        uart.write("KP: {0: 0.3f}  KI: {1: 0.3f}  KD: {2: 0.3f}\r\n".format(kp, ki, kd))
+
+    if cmd[0] == 63:
+        report(kp, ki, kd)
+    elif cmd[0] not in [b'p', b'i', b'd']:
+        uart.write("Bad parameter\r\n")
+    elif len(cmd) > 1:
+        var = cmd[0]
+        op = cmd[1]                         # =/+/-
+        if op not in [b'=', b'+', b'-']:
+            uart.write("Bad operation\r\n")
+            return (kp, ki, kd)
+
+        value = 0.0
+        try:
+            value = float(cmd[2:])                   # the value to adjust by
+        except ValueError:
+            uart.write("Bad value\r\n")
+            return (kp, ki, kd)
+
+        if var == b'p':
+            if op == b'=':
+                kp = value
+            elif op == b'+':
+                kp += value
+            else:
+                kp -= value
+        elif var == b'i':
+            if op == b'=':
+                ki = value
+            elif op == b'+':
+                ki += value
+            else:
+                ki -= value
+        else:
+            if op == b'=':
+                kd = value
+            elif op == b'+':
+                kd += value
+            else:
+                kd -= value
+        report(kp, ki, kd)
+    else:
+        uart.write("Bad command\r\n")
+
+    return (kp, ki, kd)
+
+
+def limit(x):
+    """Limit the argument to the range -1.0 to 1.0"""
+    return max([-1.0, min([1.0, x])])
+
+def run():
+    kp = 2.000
+    ki = 1.000
+    kd = 0.050
+    iterm = 0.0
+    dterm = 0.0
+
+    extreme_z_count = 0
+    error = 0.0
+    previous_error = 0.0
+    previous_time = 0.0
+    output = 0.0
+    cmd_buffer = array.array("B", [0] * 8)
+    cmd_buffer_index = 0
+
+    while True:
+        loop_start_time = time.monotonic()
+
+        # Process UART input and process complete lines
+        if uart.in_waiting > 0:
+            ch = uart.read(1)
+            if cmd_buffer_index > 7:
+                cmd_buffer_index = 0
+                uart.write("command too long.. ignored\r\n")
+            else:
+                uart.write(ch)
+                if ch == b'\r':
+                    if cmd_buffer_index > 0:
+                        kp, ki, kd = process_command(cmd_buffer[0:cmd_buffer_index], kp, ki, kd)
+                    cmd_buffer_index = 0
+                else:
+                    cmd_buffer[cmd_buffer_index] = ch[0]
+                    cmd_buffer_index += 1
+            continue
+
+
+        _, _, z = sensor.accelerometer
+        # print("z: {0: 0.3f}, adj: {1: 0.3f}".format(z, z + ACCEL_ZERO_ADJUST))
+
+        # Check if the bot fell over: a high Z value for a second.
+        # If so stop the servos and blink the tilt LED
+        # When it's righted, continue
+        if math.fabs(z) >= 6.0:
+            extreme_z_count += 1
+            if extreme_z_count > 50:
+                servo1.throttle = 0.0
+                servo2.throttle = 0.0
+                while math.fabs(z) >= 6.0:
+                    led.value = True
+                    time.sleep(0.2)
+                    led.value = False
+                    time.sleep(0.2)
+                    _, _, z = sensor.accelerometer
+                    # print("z: {0: 03f}".format(z))
+                extreme_z_count = 0
+                previous_error = 0.0
+                iterm = 0.0
+                previous_time = loop_start_time
+                error = 0.0
+                continue
+        else:
+            extreme_z_count = 0
+
+        # process the error
+        error = (z + ACCEL_ZERO_ADJUST) / 10.0
+
+        delta_time = loop_start_time - previous_time
+        delta_error = error - previous_error
+
+        if previous_time > 0.0:
+            iterm += error * delta_time
+            dterm = 0.0
+            if delta_time > 0:
+                dterm = delta_error / delta_time
+
+            output = limit((kp * error) + (ki * iterm) + (kd * dterm))
+            servo1.throttle = limit(output + SERVO1_ZERO_ADJUST)
+            servo2.throttle = limit((-1 * output) + SERVO2_ZERO_ADJUST)
+
+        previous_error = error
+        previous_time = loop_start_time
+
+
+        # print("error: {0: 0.3f}, iterm: {1: 0.3f}, dterm: {2: 0.3f},  output: {3: 0.3f}".format(error, iterm, dterm, output))
+
+        time.sleep(SAMPLE_INTERVAL - (time.monotonic() - loop_start_time))
+
+run()
diff --git a/BalanceBot/m3-thumbwheel.stl b/BalanceBot/m3-thumbwheel.stl
new file mode 100644
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--- /dev/null
+++ b/BalanceBot/m3-thumbwheel.stl
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+      vertex 5.886143e+00 7.980293e+00 3.750000e+00
+      vertex 5.886143e+00 -7.980293e+00 3.750000e+00
+      vertex 6.184925e+00 7.751029e+00 3.750000e+00
+    endloop
+  endfacet
+  facet normal -2.608706e-18 -6.177865e-17 1.000000e+00
+    outer loop
+      vertex 5.886143e+00 7.980293e+00 3.750000e+00
+      vertex 6.184925e+00 7.751029e+00 3.750000e+00
+      vertex 6.234082e+00 8.124413e+00 3.750000e+00
+    endloop
+  endfacet
+  facet normal -2.608706e-18 -6.177865e-17 1.000000e+00
+    outer loop
+      vertex 6.184925e+00 7.751029e+00 3.750000e+00
+      vertex 5.886143e+00 -7.980293e+00 3.750000e+00
+      vertex 6.184925e+00 -7.751029e+00 3.750000e+00
+    endloop
+  endfacet
+  facet normal -2.608706e-18 -6.177865e-17 1.000000e+00
+    outer loop
+      vertex 5.404910e+00 8.349556e+00 3.750000e+00
+      vertex 5.686661e+00 8.133360e+00 3.750000e+00
+      vertex 5.711644e+00 8.499824e+00 3.750000e+00
+    endloop
+  endfacet
+  facet normal -2.608706e-18 -6.177865e-17 1.000000e+00
+    outer loop
+      vertex 5.686661e+00 8.133360e+00 3.750000e+00
+      vertex 5.404910e+00 8.349556e+00 3.750000e+00
+      vertex 5.644182e+00 -8.165956e+00 3.750000e+00
+    endloop
+  endfacet
+endsolid Default
diff --git a/BalanceBot/servomount.stl b/BalanceBot/servomount.stl
new file mode 100644
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