Here are some updates

.gitignore

@@ -1,2 +1,3 @@
 .idea/
-/env
+/env
+/binaries

basics/boot.py

@@ -15,7 +15,7 @@ def connect():
     if not sta_if.isconnected():
         print("connecting to wireless network....")
         sta_if.active(True)
-        sta_if.connect(b"Candy", b"whatisdelcious")
+        sta_if.connect(b"Candy", b"whatisdelicious")
         while not sta_if.isconnected():
             pass
     print("network config:", sta_if.ifconfig())

kitchen_sink/README.md

@@ -0,0 +1,3 @@
+# The Kitchen Sink
+
+This project uses most of the code from other projects. It pretty much does most things.

kitchen_sink/main.py

@@ -0,0 +1,78 @@
+from dht import DHT11
+from machine import Pin, SPI, ADC
+from ssd1306 import SSD1306_SPI
+from time import sleep
+
+# Buttons and Knobs Pins
+BUTTON_PIN = Pin(34, Pin.IN)
+POT_PIN = ADC(Pin(35))
+
+# DHT Sensor
+DHT_PIN = DHT11(Pin(26))
+
+# SPI PINS
+MISO_PIN = Pin(19)
+MOSI_PIN = Pin(23)
+SCK_PIN = Pin(18)
+DC_PIN = Pin(4, Pin.OUT)
+CS_PIN = Pin(5, Pin.OUT)
+RST_PIN = Pin(2, Pin.OUT)
+
+# VSPI Hardware channel. 80 MHz signal rate
+vspi = SPI(2, baudrate=2600000, polarity=0, phase=0, bits=8, firstbit=0, sck=SCK_PIN, mosi=MOSI_PIN, miso=MISO_PIN)
+
+oled = SSD1306_SPI(128, 64, vspi, DC_PIN, RST_PIN, CS_PIN)
+
+
+class DisplayWriter:
+
+    def __init__(self, spi):
+        self.spi = spi
+        self.height = spi.height
+        self.width = spi.width
+
+    def msg(self, msg: str, l_offset=0, top_offset=0) -> None:
+        """Writes a message to an OLED display.
+
+        Will wrap text as needed.
+        """
+        self.spi.fill(0)
+        formatted_msg = self._split_msg(msg, l_offset, top_offset)
+        for s, left, top in formatted_msg:
+            self.spi.text(s, left, top)
+        self.spi.show()
+
+    # Todo make this a generator
+    def _split_msg(self, msg, l_offset, top_offset) -> list:
+        """Splits a message at screen width to be used for text wrapping."""
+        _top_offset = top_offset
+        result = []
+        for e in msg.split('\n'):
+            result.append((e, l_offset, _top_offset))
+            _top_offset += 10
+        return result
+
+
+def dht_report(dht_pin):
+    dht_pin.measure()
+    _temp = dht_pin.temperature()
+    _hum = dht_pin.humidity()
+    return _temp, _hum
+
+
+def celsius_to_fahrenheit(celsius: int):
+    return (celsius * (9 / 5)) + 32
+
+
+display = DisplayWriter(oled)
+
+while True:
+    button_val = BUTTON_PIN.value()
+    light_sensor = round(POT_PIN.read() / 4096 * 100)
+    temp, hum = dht_report(DHT_PIN)
+    report = "Temp: {}C/{}F\nHum: {}%\nButton: {}\nLight: {}%".format(temp, celsius_to_fahrenheit(temp), hum,
+                                                                      button_val, light_sensor)
+    # print(report)
+    oled.invert(button_val)
+    display.msg(report)
+    sleep(0.1)

kitchen_sink/ssd1306.py

@@ -0,0 +1,145 @@
+# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
+# https://github.com/micropython/micropython/blob/master/drivers/display/ssd1306.py
+
+from micropython import const
+import framebuf
+
+# register definitions
+SET_CONTRAST = const(0x81)
+SET_ENTIRE_ON = const(0xa4)
+SET_NORM_INV = const(0xa6)
+SET_DISP = const(0xae)
+SET_MEM_ADDR = const(0x20)
+SET_COL_ADDR = const(0x21)
+SET_PAGE_ADDR = const(0x22)
+SET_DISP_START_LINE = const(0x40)
+SET_SEG_REMAP = const(0xa0)
+SET_MUX_RATIO = const(0xa8)
+SET_COM_OUT_DIR = const(0xc0)
+SET_DISP_OFFSET = const(0xd3)
+SET_COM_PIN_CFG = const(0xda)
+SET_DISP_CLK_DIV = const(0xd5)
+SET_PRECHARGE = const(0xd9)
+SET_VCOM_DESEL = const(0xdb)
+SET_CHARGE_PUMP = const(0x8d)
+
+
+# Subclassing FrameBuffer provides support for graphics primitives
+# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
+class SSD1306(framebuf.FrameBuffer):
+    def __init__(self, width, height, external_vcc):
+        self.width = width
+        self.height = height
+        self.external_vcc = external_vcc
+        self.pages = self.height // 8
+        self.buffer = bytearray(self.pages * self.width)
+        super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
+        self.init_display()
+
+    def init_display(self):
+        for cmd in (
+                SET_DISP | 0x00,  # off
+                # address setting
+                SET_MEM_ADDR, 0x00,  # horizontal
+                # resolution and layout
+                SET_DISP_START_LINE | 0x00,
+                SET_SEG_REMAP | 0x01,  # column addr 127 mapped to SEG0
+                SET_MUX_RATIO, self.height - 1,
+                SET_COM_OUT_DIR | 0x08,  # scan from COM[N] to COM0
+                SET_DISP_OFFSET, 0x00,
+                SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
+                # timing and driving scheme
+                SET_DISP_CLK_DIV, 0x80,
+                SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
+                SET_VCOM_DESEL, 0x30,  # 0.83*Vcc
+                # display
+                SET_CONTRAST, 0xff,  # maximum
+                SET_ENTIRE_ON,  # output follows RAM contents
+                SET_NORM_INV,  # not inverted
+                # charge pump
+                SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
+                SET_DISP | 0x01):  # on
+            self.write_cmd(cmd)
+        self.fill(0)
+        self.show()
+
+    def poweroff(self):
+        self.write_cmd(SET_DISP | 0x00)
+
+    def poweron(self):
+        self.write_cmd(SET_DISP | 0x01)
+
+    def contrast(self, contrast):
+        self.write_cmd(SET_CONTRAST)
+        self.write_cmd(contrast)
+
+    def invert(self, invert):
+        self.write_cmd(SET_NORM_INV | (invert & 1))
+
+    def show(self):
+        x0 = 0
+        x1 = self.width - 1
+        if self.width == 64:
+            # displays with width of 64 pixels are shifted by 32
+            x0 += 32
+            x1 += 32
+        self.write_cmd(SET_COL_ADDR)
+        self.write_cmd(x0)
+        self.write_cmd(x1)
+        self.write_cmd(SET_PAGE_ADDR)
+        self.write_cmd(0)
+        self.write_cmd(self.pages - 1)
+        self.write_data(self.buffer)
+
+
+class SSD1306_I2C(SSD1306):
+    def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
+        self.i2c = i2c
+        self.addr = addr
+        self.temp = bytearray(2)
+        self.write_list = [b'\x40', None]  # Co=0, D/C#=1
+        super().__init__(width, height, external_vcc)
+
+    def write_cmd(self, cmd):
+        self.temp[0] = 0x80  # Co=1, D/C#=0
+        self.temp[1] = cmd
+        self.i2c.writeto(self.addr, self.temp)
+
+    def write_data(self, buf):
+        self.write_list[1] = buf
+        self.i2c.writevto(self.addr, self.write_list)
+
+
+class SSD1306_SPI(SSD1306):
+    def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
+        self.rate = 10 * 1024 * 1024
+        dc.init(dc.OUT, value=0)
+        res.init(res.OUT, value=0)
+        cs.init(cs.OUT, value=1)
+        self.spi = spi
+        self.dc = dc
+        self.res = res
+        self.cs = cs
+        import time
+        self.res(1)
+        time.sleep_ms(1)
+        self.res(0)
+        time.sleep_ms(10)
+        self.res(1)
+        super().__init__(width, height, external_vcc)
+
+    def write_cmd(self, cmd):
+        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
+        self.cs(1)
+        self.dc(0)
+        self.cs(0)
+        self.spi.write(bytearray([cmd]))
+        self.cs(1)
+
+    def write_data(self, buf):
+        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
+        self.cs(1)
+        self.dc(1)
+        self.cs(0)
+        self.spi.write(buf)
+        self.cs(1)

light_sensor/README.md

@@ -1,3 +1,5 @@
 # MQTT Light Sensor
 
-This project uses a simple photo resistor to capture data and push the result to an MQTT broker.
+This project uses a simple photo resistor to capture data and push the result to an MQTT broker.
+
+It was one of my first attempts at build a Micropython project.

light_sensor/umqtt/simple.py

@@ -2,9 +2,11 @@ import usocket as socket
 import ustruct as struct
 from ubinascii import hexlify
 
+
 class MQTTException(Exception):
     pass
 
+
 class MQTTClient:
 
     def __init__(self, client_id, server, port=0, user=None, password=None, keepalive=0,
@@ -85,7 +87,7 @@ class MQTTClient:
 
         self.sock.write(premsg, i + 2)
         self.sock.write(msg)
-        #print(hex(len(msg)), hexlify(msg, ":"))
+        # print(hex(len(msg)), hexlify(msg, ":"))
         self._send_str(self.client_id)
         if self.lw_topic:
             self._send_str(self.lw_topic)
@@ -119,7 +121,7 @@ class MQTTClient:
             sz >>= 7
             i += 1
         pkt[i] = sz
-        #print(hex(len(pkt)), hexlify(pkt, ":"))
+        # print(hex(len(pkt)), hexlify(pkt, ":"))
         self.sock.write(pkt, i + 1)
         self._send_str(topic)
         if qos > 0:
@@ -146,7 +148,7 @@ class MQTTClient:
         pkt = bytearray(b"\x82\0\0\0")
         self.pid += 1
         struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
-        #print(hex(len(pkt)), hexlify(pkt, ":"))
+        # print(hex(len(pkt)), hexlify(pkt, ":"))
         self.sock.write(pkt)
         self._send_str(topic)
         self.sock.write(qos.to_bytes(1, "little"))
@@ -154,7 +156,7 @@ class MQTTClient:
             op = self.wait_msg()
             if op == 0x90:
                 resp = self.sock.read(4)
-                #print(resp)
+                # print(resp)
                 assert resp[1] == pkt[2] and resp[2] == pkt[3]
                 if resp[3] == 0x80:
                     raise MQTTException(resp[3])
@@ -201,4 +203,4 @@ class MQTTClient:
     # the same processing as wait_msg.
     def check_msg(self):
         self.sock.setblocking(False)
-        return self.wait_msg()
+        return self.wait_msg()

ssd1306_oled/README.md

@@ -30,4 +30,7 @@ To invert colors:
 oled.invert(True)
 ```
 
+A `DisplayWriter` was added as a convenience to writing out messages to the OLED. Use this for printing text messages to the display. Newline characters will dwa
+```
 
+```

ssd1306_oled/main.py

@@ -6,7 +6,7 @@ from time import sleep
 # DHT Sensor
 DHT_PIN = DHT11(Pin(26))
 
-# OLD PINS
+# SPI PINS
 MISO_PIN = Pin(19)
 MOSI_PIN = Pin(23)
 SCK_PIN = Pin(18)
@@ -56,11 +56,16 @@ def dht_report(dht_pin):
     return _temp, _hum
 
 
+def celsius_to_fahrenheit(celsius: int):
+    return (celsius * (9 / 5)) + 32
+
+
 display = DisplayWriter(oled)
 
 while True:
-    temp, hum = dht_report(DHT_PIN)
+    cel, hum = dht_report(DHT_PIN)
-    report = "Temp: {}C\nHum: {}%".format(temp, hum)
+    fahr = celsius_to_fahrenheit(cel)
+    report = "Temp: {}C/{}F\nHum: {}%".format(cel, fahr, hum)
     print(report)
     display.msg(report)
     sleep(1)

threading/README.md

@@ -0,0 +1,3 @@
+# Threading
+
+The ESP32 has two cores, but Micropython will only run in single core mode. We can however use threading.

threading/hello_threading.py

@@ -0,0 +1,11 @@
+import _thread
+import time
+
+
+def testThread():
+    while True:
+        print("Hello threading")
+        time.sleep(15) # Time is so high so that we can actually get a repl.
+
+
+_thread.start_new_thread(testThread, ())

threading/threading2.py

@@ -0,0 +1,2 @@
+import _thread
+