diff --git a/esp32/dfplayer.py b/esp32/dfplayer.py
new file mode 100644
index 0000000..11f8363
--- /dev/null
+++ b/esp32/dfplayer.py
@@ -0,0 +1,201 @@
+#Driver for DFPlayer mini, MP3 player with SD card slot, using serial communication.
+
+#See documentation at:
+#  https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299
+
+#0 Each command starts with byte 0x7E
+#1 Version # (set to 0xFF)
+#2 The number of bytes which follow (6, Not including checksum and termination)
+#3 The command to execute
+#4 Feedback indicator (0: no, 1: yes)
+#5 Argument high byte
+#6 Argument low byte
+#7-8 2 byte checksum
+#9 Termination byte 0xEF
+
+#Commands
+#The next and prev commands wrap when they hit the end of the list.
+#0x01   next
+#0x02   prev
+#0x03   Track # 0-2999
+#0x04   volume +
+#0x05   volume -
+#0x06   volume #0-30
+#0x07   equalizer 0-5 (Normal, Pop, Rock, Jazz, Classical, Base)
+#0x08   playback mode 0-3 (Repeat, folder repeat, single repeat, random)
+#0x09   playback source 0-3 (U, TF, AUX, SLEEP, FLASH)
+#0x0A   sleep mode
+#0x0B   Normal mode
+#0x0C   reset
+#0x0D   play/resume
+#0x0E   pause
+#0x0F   specify folder 1-10
+#0x10   volume adjust (High byte = Open volume adjust, Low byte = volume gain 0-31)
+#0x11   repeat 0 = stop, 1 = repeat.
+
+#Query commands
+#0x3F   Send init parameters 0-0x0F.
+#0x41   Reply.  The command byte is set to this on a reply read from the dfplayer as a reply if
+#                 the the feedback indicator was set on the command.  Not very useful.
+#0x42   status
+#0x43   volume
+#0x44   eq
+#0x45   playback mode
+#0x46   software version
+#0x47   # of TF card files
+#0x48   # of SD card files
+#0x49   # of flash files
+#0x4A   Keep on ?
+#0x4B   Current TF card track
+#0x4C   Current SD card track
+#0x4D   Current flash track
+
+#Results - These are sent as replies to certain commands.
+#0x3D   Result of play, next, prev (param hi/lo is current file index)
+
+#  Folders are named 01, 02..99.  Files 001, 002 ... 999.
+
+from machine import UART
+from time import sleep_ms
+
+class dfplayer(UART) :
+
+  _WAIT = const(10)
+
+  '''Initialize dfplayer at given UART 0-2'''
+  def __init__(self, aUART, aBaud = 9600) :
+    super(dfplayer, self).__init__(aUART, aBaud)
+    self._buffer = bytearray(10)
+    self._buffer[0] = 0x7E  #commands always start with these bytes.
+    self._buffer[1] = 0xFF  #Version #
+    self._buffer[2] = 6     #Commands are always 6 bytes
+    self._buffer[4] = 0     #We never want results returned. (0x41)  This is just an ack we don't use.
+    self._buffer[9] = 0xEF  #Command terminator.
+    self._readbuffer = bytearray(20)
+
+  def _clear( self ) :
+    while self.any() :
+      self.readinto(self._readbuffer)
+
+  def _cmd( self, aCommand, aArg = 0 ) :
+    '''Send aCommand to hc05 with given argument.'''
+    self._buffer[3] = aCommand
+    self._buffer[5] = aArg >> 8
+    self._buffer[6] = aArg
+
+    cs = 0
+    for i in range(1, 7) :
+      cs -= self._buffer[i]
+
+    #Set the checksum.
+    self._buffer[7] = cs >> 8
+    self._buffer[8] = cs
+
+    self._clear()  #Make sure return buffer is empty.
+    self.write(self._buffer)
+
+  @property
+  def readbuffer( self ):
+    return self._readbuffer
+
+  def result( self  ) :
+    '''Wait for result and return # of bytes read.  Result is in _readbuffer.'''
+    for i in range(1, 100) :
+      if self.any() :
+        return self.readinto(self._readbuffer)
+      sleep_ms(_WAIT)
+
+    return 0
+
+  def resultnum( self ) :
+    '''Read result, then pull 16 bit # from it.'''
+    res = self.result()
+    if res >= 10 :
+      return (self._readbuffer[5] << 8 | self._readbuffer[6])
+    return 0
+
+  def printres( self ) :
+    '''Print result as string of hex values.'''
+    b = self.result()
+    for i in range(0, b) :
+      print(str(hex(self._readbuffer[i])) + ',', end='')
+    print('/')
+
+  def next( self ) :
+    '''Play next song.'''
+    self._cmd(1)
+
+  def prev( self ) :
+    '''Play previous song.'''
+    self._cmd(2)
+
+  def play( self, aIndex ) :
+    '''Play song at given index.'''
+    self._cmd(3, aIndex)
+
+  def volume( self, aLevel ) :
+    '''Set volume to absolute value.'''
+    self._cmd(6, aLevel & 0x1E)
+
+  def qvolume( self ) :
+    self._cmd(0x43)
+    return self.resultnum()
+
+  def equalizer( self, aArg ) :
+    '''Set equalizer type. (Normal, Pop, Rock, Jazz, Classical, Base)'''
+    self._cmd(7, aArg)
+
+  def qequalizer( self ) :
+    self._cmd(0x44)
+    return self.resultnum()
+
+  def qsdfiles( self ) :
+    '''return # of files on sd card.'''
+    self._cmd(0x48)
+    return self.resultnum()
+
+  def qsdtrack( self ) :
+    '''return current sd card track #.'''
+    self._cmd(0x4C)
+    return self.resultnum()
+
+  def qflashfiles( self ) :
+    '''return # of files in flash memory.'''
+    self._cmd(0x49)
+    return self.resultnum()
+
+  def qflashtrack( self ) :
+    '''return current flash track #.'''
+    self._cmd(0x4D)
+    return self.resultnum()
+
+  def sleep( self, abSleep ) :
+    '''Set/clear low power mode.'''
+    self._cmd(0xA if abSleep else 0xB)
+
+  def reset( self ) :
+    '''Reset the device.'''
+    self._cmd(0x0C)
+
+  def pause( self, abTF ) :
+    '''Pause or resume play.'''
+    p = 0x0E if abTF else 0x0D
+    self._cmd(0x0E)
+
+  def folder( self, aDir ) :
+    '''Specify folder.'''
+    self._cmd(0x0F, aDir)
+
+  def folderandfile( self, aFolder, aFile ) :
+    '''Play specified file in specified folder.'''
+    self._cmd(0x12, (aFolder << 8) | aFile)
+
+  def playback( self, aMode ) :
+    '''Set playback mode: 0-Repeat, 1-Folder repeat, 2-Single repeat, 3-Random'''
+    self._cmd(8, aMode)
+
+  def source( self, aSource ) :
+    '''Set play source, 0-SD, 1-TF, 2-AUX, 3-SLEEP, 4-FLASH.
+    I don't know what TF, AUX or SLEEP are.'''
+    self._cmd(9, aSource)
+
diff --git a/esp32/jq6500.py b/esp32/jq6500.py
new file mode 100644
index 0000000..825f462
--- /dev/null
+++ b/esp32/jq6500.py
@@ -0,0 +1,101 @@
+#Driver for JQ6500 MP3 player, using serial communication.
+
+#See documentation at:
+#  https://www.elecfreaks.com/wiki/index.php?title=JQ6500_Mini_MP3_Module
+#  http://sparks.gogo.co.nz/jq6500/index.html
+
+#Each command starts with byte 0x7E
+#Followed by a byte indicating the number of bytes which follow including the terminating byte (including termination)
+#Followed by a byte indicating the command to execute
+#Followed by an optional first argument byte
+#Followed by an optional second argument byte
+#Followed by the byte 0xEF as the termination byte
+
+#The next and prev commands wrap when they hit the end of the list.
+#next (play next song)                0x7E 02 01 EF
+#prev (play prev song)                0x7E 02 02 EF
+#play song at index nn = 1-??         0x7E 04 03 nn nn EF.
+#volume+                              0x7E 02 04 EF
+#volume-                              0x7E 02 05 EF
+#assigned volume nn = 0-30            0x7E 03 06 nn EF
+#assigned eq nn (0-5)                 0x7E 03 07 nn EF
+#  Eq values are Normal, Pop, Rock, Jazz, Classical, Base
+#sleep mode                           0x7E 02 0A EF
+#chip reset                           0x7E 02 0C EF
+#play                                 0x7E 02 0D EF
+#pause                                0x7E 02 0E EF
+#next/pref folder 1 = next, 0 = prev  0x7E 03 0F nn EF
+#play folder/file (mm,nn)             0x7E 04 12 mm nn EF
+#  Folders are named 01, 02..99.  Files 001, 002 ... 999.
+
+from machine import UART
+
+class jq6500(UART):
+  '''Initialize jq6500 at given UART 0-2'''
+  def __init__(self, aUART, aBaud = 9600):
+    super(jq6500, self).__init__(aUART, aBaud)
+    self._buffer = bytearray(8)
+    self._buffer[0] = 0x7E #commands always start with this.
+
+  def _write( self, *aCommand ) :
+    '''Write command bytes to device.'''
+    i = 2 #Commands are always at least 2 in length.
+    for v in aCommand :
+      self._buffer[i] = v
+      i += 1
+
+    self._buffer[1] = i - 1 #Set length of command string.
+    self._buffer[i] = 0xEF #Put terminator at end of command string.
+    self.write(self._buffer)
+
+#  def next( self ) :
+#    '''Play next song.'''
+#    self._write(01)
+#
+#  def prev( self ) :
+#    '''Play previous song.'''
+#    self._write(02)
+
+  def play( self, aIndex ) :
+    '''Play song at given index.'''
+    self._write(03, aIndex >> 8, aIndex)
+
+#  def volumechange( self, aDir ) :
+#    '''Adjust volume up/down by given amount.'''
+#    if aDir < 0 :
+#      d = 4
+#      aDir = -aDir
+#    else:
+#      d = 5
+#    for x in range(0, aDir):
+#      self._write(d)
+
+  def volume( self, aLevel ) :
+    '''Set volume to absolute value.'''
+    self._write(06, aLevel & 0x1E)
+
+  def equalizer( self, aArg ) :
+    '''Set equalizer type. (Normal, Pop, Rock, Jazz, Classical, Base)'''
+    self._write(07, aArg)
+
+  def sleep( self ) :
+    '''Go into low power mode.'''
+    self._write(0x0A)
+
+#  def reset( self ) :
+#    '''Reset the device.'''
+#    self._write(0x0C)
+#
+#  def pause( self, abTF ) :
+#    '''Pause or resume play.'''
+#    p = 0x0E if abTF else 0x0D
+#    self._write(0x0E)
+#
+#  def nextfolder( self, aDir ) :
+#    '''Next folder.'''
+#    self.write(0x0F, 1 if aDir else 0)
+#
+#  def folderandfile( self, aFolder, aFile ) :
+#    '''Play specified file in specified folder.'''
+#    self.write(12, aFolder, aFile)
+
diff --git a/esp32/quicrun.py b/esp32/quicrun.py
new file mode 100644
index 0000000..01dbab1
--- /dev/null
+++ b/esp32/quicrun.py
@@ -0,0 +1,64 @@
+# Controller for the quicrun 1060 Electronic Speed Control (ESP)
+#This controller works through the pca9865 servo controller.
+
+from time import sleep_ms
+
+#todo: May need to move speed values over time if the battery cannot handle it.
+
+class quicrun(object):
+  '''docstring for quicrun'''
+  _STOP = const(50)
+  _FORWARD_MAX = const(68)
+  _FORWARD_MIN = const(52)
+  _BACKWARD_MAX = const(30)
+  _BACKWARD_MIN = const(48)
+  _BACKWARD_INIT = const(45)
+
+  @staticmethod
+  def getperc( aMin, aMax, aPerc  ) :
+    return (((aMax - aMin) * aPerc) // 100) + aMin
+
+  def __init__(self, aPCA, aIndex):
+    '''aPCA = pca9865 object to use for PWM control of the ESC.
+       aIndex = Servo index on pca9865 (0-15).
+    '''
+    super(quicrun, self).__init__()
+    self._pca = aPCA
+    self._index = aIndex
+    self.reset()
+
+  def reset( self ) :
+    self._pca.set(self._index, 75)
+    sleep_ms(500)
+    self._pca.set(self._index, 100)
+    sleep_ms(500)
+    self._pca.set(self._index, _STOP)
+    self._curspeed = 0
+
+  def _set( self, aValue ) :
+    self._pca.set(self._index, aValue)
+
+  def _reverse( self ) :
+    if self._currspeed >= 0 :
+      self._set(_STOP)
+      sleep_ms(100)
+      self._set(_BACKWARD_INIT)
+      sleep_ms(100)
+      self._set(_STOP)
+      sleep_ms(100)
+
+  def speed( self, aSpeed ) :
+    '''Set speed -100 to 100.'''
+    aSpeed = max(min(100, aSpeed), -100)
+
+    if aSpeed == 0 :
+      self._set(_STOP)
+    else:
+      if aSpeed > 0 :
+        self._set(quicrun.getperc(_FORWARD_MIN, _FORWARD_MAX, aSpeed))
+      else:
+        self._reverse()
+        self._set(quicrun.getperc(_BACKWARD_MAX, _BACKWARD_MIN, 100 + aSpeed))
+
+    self._currspeed = aSpeed
+