diff --git a/docs/static/microbitheart.svg b/docs/static/microbitheart.svg
new file mode 100644
index 00000000..ebe35532
--- /dev/null
+++ b/docs/static/microbitheart.svg
@@ -0,0 +1,94 @@
+<svg version="1.0" viewBox="0 0 498 406" enable-background="new 0 0 498 406" class="sim" x="0px" y="0px"><style>
+svg.sim {
+    margin-bottom:1em;
+}
+svg.sim.grayscale {    
+    -moz-filter: grayscale(1);
+    -webkit-filter: grayscale(1);
+    filter: grayscale(1);
+}
+.sim-button {
+    pointer-events: none;    
+}
+
+.sim-button-outer:hover {
+    stroke:grey;
+    stroke-width: 3px;
+}
+
+.sim-pin:hover {
+    stroke:#D4AF37;
+    stroke-width:2px;
+}
+
+.sim-pin-touch.touched:hover {
+    stroke:darkorange;
+}
+
+.sim-led-back:hover {
+    stroke:#a0a0a0;
+    stroke-width:3px;
+}
+.sim-led:hover {
+    stroke:#ff7f7f;
+    stroke-width:3px;
+}
+
+.sim-systemled {
+    fill:#333;
+    stroke:#555;
+    stroke-width: 1px;
+}
+
+.sim-light-level-button {
+    stroke:#fff;
+    stroke-width: 3px;
+}
+
+.sim-antenna {
+    stroke:#555;
+    stroke-width: 2px;
+}
+
+.sim-text {
+  font-family:monospace;
+  font-size:25px;
+  fill:#fff;
+  pointer-events: none;
+}
+
+.sim-text-pin {
+  font-family:monospace;
+  font-size:20px;
+  fill:#fff;
+  pointer-events: none;
+}
+
+.sim-thermometer {
+    stroke:#aaa;
+    stroke-width: 3px;
+}
+
+/* animations */
+.sim-flash {
+    animation-name: sim-flash-animation;
+    animation-duration: 0.1s;
+}
+
+@keyframes sim-flash-animation {  
+    from { fill: yellow; }
+    to   { fill: default; }
+}
+
+.sim-flash-stroke {
+    animation-name: sim-flash-stroke-animation;
+    animation-duration: 0.4s;
+    animation-timing-function: ease-in;
+}
+
+@keyframes sim-flash-stroke-animation {  
+    from { stroke: yellow; }
+    to   { stroke: default; }
+}
+
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width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(1,1)</title></rect><rect class="sim-led-back" x="246" y="157" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="244" y="155" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 1;"><title>(2,1)</title></rect><rect class="sim-led-back" x="292" y="157" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="290" y="155" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(3,1)</title></rect><rect class="sim-led-back" x="338" y="157" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="336" y="155" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 1;"><title>(4,1)</title></rect><rect class="sim-led-back" x="154" y="201" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="152" y="199" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 1;"><title>(0,2)</title></rect><rect class="sim-led-back" x="200" y="201" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="198" y="199" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(1,2)</title></rect><rect class="sim-led-back" x="246" y="201" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="244" y="199" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(2,2)</title></rect><rect class="sim-led-back" x="292" y="201" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="290" y="199" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(3,2)</title></rect><rect class="sim-led-back" x="338" y="201" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="336" y="199" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 1;"><title>(4,2)</title></rect><rect class="sim-led-back" x="154" y="245" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="152" y="243" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(0,3)</title></rect><rect class="sim-led-back" x="200" y="245" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="198" y="243" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 1;"><title>(1,3)</title></rect><rect class="sim-led-back" x="246" y="245" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="244" y="243" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(2,3)</title></rect><rect class="sim-led-back" x="292" y="245" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="290" y="243" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 1;"><title>(3,3)</title></rect><rect class="sim-led-back" x="338" y="245" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="336" y="243" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(4,3)</title></rect><rect class="sim-led-back" x="154" y="289" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="152" y="287" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(0,4)</title></rect><rect class="sim-led-back" x="200" y="289" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="198" y="287" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(1,4)</title></rect><rect class="sim-led-back" x="246" y="289" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="244" y="287" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 1;"><title>(2,4)</title></rect><rect class="sim-led-back" x="292" y="289" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="290" y="287" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(3,4)</title></rect><rect class="sim-led-back" x="338" y="289" width="10" height="20" rx="2" ry="2" style="fill: rgb(32, 32, 32);"></rect><rect class="sim-led" x="336" y="287" width="14" height="24" rx="3" ry="3" style="fill: rgb(255, 127, 127); opacity: 0;"><title>(4,4)</title></rect><g><circle cx="258" cy="75" r="100" fill="transparent"></circle><path class="sim-theme" 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M21.2,341.6c0-10.7,8.7-19.3,19.3-19.3c10.7,0,19.3,8.7,19.3,19.3c0,10.7-8.6,19.3-19.3,19.3C29.9,360.9,21.2,352.2,21.2,341.6z" fill="url(#gradient-pin-0)"><title>P0, ANALOG IN</title></path><path class="sim-pin sim-pin-touch" d="M139.1,317.3c-12.8,0-22.1,10.3-23.1,23.1V406h46.2v-65.6C162.2,327.7,151.9,317.3,139.1,317.3zM139.3,360.1c-10.7,0-19.3-8.6-19.3-19.3c0-10.7,8.6-19.3,19.3-19.3c10.7,0,19.3,8.7,19.3,19.3C158.6,351.5,150,360.1,139.3,360.1z" fill="url(#gradient-pin-1)"><title>P1, ANALOG IN</title></path><path class="sim-pin sim-pin-touch" d="M249,317.3c-12.8,0-22.1,10.3-23.1,23.1V406h46.2v-65.6C272.1,327.7,261.8,317.3,249,317.3z M249.4,360.1c-10.7,0-19.3-8.6-19.3-19.3c0-10.7,8.6-19.3,19.3-19.3c10.7,0,19.3,8.7,19.3,19.3C268.7,351.5,260.1,360.1,249.4,360.1z" fill="url(#gradient-pin-2)"><title>P2, ANALOG IN</title></path><path class="sim-pin" d="M0,357.7v19.2c0,10.8,6.2,20.2,14.4,25.2v-44.4H0z" fill="url(#gradient-pin-3)"><title>P3, ANALOG IN, LED Col 1</title></path><rect x="66.7" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-4)"><title>P4, ANALOG IN, LED Col 2</title></rect><rect x="79.1" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-5)"><title>P5, BUTTON A</title></rect><rect x="91.4" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-6)"><title>P6, LED Col 9</title></rect><rect x="103.7" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-7)"><title>P7, LED Col 8</title></rect><rect x="164.3" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-8)"><title>P8</title></rect><rect x="176.6" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-9)"><title>P9, LED Col 7</title></rect><rect x="188.9" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-10)"><title>P10, ANALOG IN, LED Col 3</title></rect><rect x="201.3" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-11)"><title>P11, BUTTON B</title></rect><rect x="213.6" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-12)"><title>P12, RESERVED ACCESSIBILITY</title></rect><rect x="275.2" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-13)"><title>P13, SPI - SCK</title></rect><rect x="287.5" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-14)"><title>P14, SPI - MISO</title></rect><rect x="299.8" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-15)"><title>P15, SPI - MOSI</title></rect><rect x="312.1" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-16)"><title>P16, SPI - Chip Select</title></rect><rect x="324.5" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-17)"><title>P17, +3v3</title></rect><rect x="385.1" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-18)"><title>P18, +3v3</title></rect><rect x="397.4" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-19)"><title>P19, I2C - SCL</title></rect><rect x="409.7" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-20)"><title>P20, I2C - SDA</title></rect><rect x="422" y="356.7" width="10" height="50" class="sim-pin" fill="url(#gradient-pin-21)"><title>GND</title></rect><path class="sim-pin" d="M483.6,402c8.2-5,14.4-14.4,14.4-25.1v-19.2h-14.4V402z" fill="url(#gradient-pin-22)"><title>GND</title></path><path class="sim-pin" d="M359.9,317.3c-12.8,0-22.1,10.3-23.1,23.1V406H383v-65.6C383,327.7,372.7,317.3,359.9,317.3z M360,360.1c-10.7,0-19.3-8.6-19.3-19.3c0-10.7,8.6-19.3,19.3-19.3c10.7,0,19.3,8.7,19.3,19.3C379.3,351.5,370.7,360.1,360,360.1z" fill="url(#gradient-pin-23)"><title>+3v3</title></path><path class="sim-pin" d="M458,317.6c-13,0-23.6,10.6-23.6,23.6c0,0,0,0.1,0,0.1h0V406H469c4.3,0,8.4-1,12.6-2.7v-60.7c0-0.4,0-0.9,0-1.3C481.6,328.1,471,317.6,458,317.6z M457.8,360.9c-10.7,0-19.3-8.6-19.3-19.3c0-10.7,8.6-19.3,19.3-19.3c10.7,0,19.3,8.7,19.3,19.3C477.1,352.2,468.4,360.9,457.8,360.9z" fill="url(#gradient-pin-24)"><title>GND</title></path><text class="sim-text-pin" x="67" y="345"></text><text class="sim-text-pin" x="165" y="345"></text><text class="sim-text-pin" x="275" y="345"></text><path class="sim-button-outer" d="M82.1,232.6H25.9c-0.5,0-1-0.4-1-1v-56.2c0-0.5,0.4-1,1-1h56.2c0.5,0,1,0.4,1,1v56.2C83,232.2,82.6,232.6,82.1,232.6" style="fill: rgb(151, 151, 151);"><title>A</title></path><path class="sim-button" d="M69.7,203.5c0,8.7-7,15.7-15.7,15.7s-15.7-7-15.7-15.7c0-8.7,7-15.7,15.7-15.7S69.7,194.9,69.7,203.5" style="fill: rgb(0, 0, 0);"></path><path class="sim-button-outer" d="M474.3,232.6h-56.2c-0.5,0-1-0.4-1-1v-56.2c0-0.5,0.4-1,1-1h56.2c0.5,0,1,0.4,1,1v56.2C475.3,232.2,474.8,232.6,474.3,232.6" style="fill: rgb(151, 151, 151);"><title>B</title></path><path class="sim-button" d="M461.9,203.5c0,8.7-7,15.7-15.7,15.7c-8.7,0-15.7-7-15.7-15.7c0-8.7,7-15.7,15.7-15.7C454.9,187.8,461.9,194.9,461.9,203.5" style="fill: rgb(0, 0, 0);"></path><rect class="sim-button-outer" x="417" y="250" width="58" height="58" rx="1" ry="1" style="visibility: hidden; fill: rgb(51, 51, 51);"><title>A+B</title></rect><circle class="sim-button" cx="446" cy="278" r="16.5" style="visibility: hidden; fill: rgb(0, 0, 0);"></circle><path class="sim-label" d="M35.7,376.4c0-2.8,2.1-5.1,5.5-5.1c3.3,0,5.5,2.4,5.5,5.1v4.7c0,2.8-2.2,5.1-5.5,5.1c-3.3,0-5.5-2.4-5.5-5.1V376.4zM43.3,376.4c0-1.3-0.8-2.3-2.2-2.3c-1.3,0-2.1,1.1-2.1,2.3v4.7c0,1.2,0.8,2.3,2.1,2.3c1.3,0,2.2-1.1,2.2-2.3V376.4z"></path><path class="sim-label" d="M136.2,374.1c2.8,0,3.4-0.8,3.4-2.5h2.9v14.3h-3.4v-9.5h-3V374.1z"></path><path class="sim-label" d="M248.6,378.5c1.7-1,3-1.7,3-3.1c0-1.1-0.7-1.6-1.6-1.6c-1,0-1.8,0.6-1.8,2.1h-3.3c0-2.6,1.8-4.6,5.1-4.6c2.6,0,4.9,1.3,4.9,4.3c0,2.4-2.3,3.9-3.8,4.7c-2,1.3-2.5,1.8-2.5,2.9h6.1v2.7h-10C244.8,381.2,246.4,379.9,248.6,378.5z"></path><path class="sim-label" d="M48.1,270.9l-0.6-1.7h-5.1l-0.6,1.7h-3.5l5.1-14.3h3.1l5.2,14.3H48.1z M45,260.7l-1.8,5.9h3.5L45,260.7z"></path><path class="sim-label" d="M449.1,135.8h5.9c3.9,0,4.7,2.4,4.7,3.9c0,1.8-1.4,2.9-2.5,3.2c0.9,0,2.6,1.1,2.6,3.3c0,1.5-0.8,4-4.7,4h-6V135.8zM454.4,141.7c1.6,0,2-1,2-1.7c0-0.6-0.3-1.7-2-1.7h-2v3.4H454.4z M452.4,144.1v3.5h2.1c1.6,0,2-1,2-1.8c0-0.7-0.4-1.8-2-1.8H452.4z"></path><path class="sim-label" d="M352.1,381.1c0,1.6,0.9,2.5,2.2,2.5c1.2,0,1.9-0.9,1.9-1.9c0-1.2-0.6-2-2.1-2h-1.3v-2.6h1.3c1.5,0,1.9-0.7,1.9-1.8c0-1.1-0.7-1.6-1.6-1.6c-1.4,0-1.8,0.8-1.8,2.1h-3.3c0-2.4,1.5-4.6,5.1-4.6c2.6,0,5,1.3,5,4c0,1.6-1,2.8-2.1,3.2c1.3,0.5,2.3,1.6,2.3,3.5c0,2.7-2.4,4.3-5.2,4.3c-3.5,0-5.5-2.1-5.5-5.1H352.1z"></path><path class="sim-label" d="M368.5,385.9h-3.1l-5.1-14.3h3.5l3.1,10.1l3.1-10.1h3.6L368.5,385.9z"></path><path class="sim-label" d="M444.4,378.3h7.4v2.5h-1.5c-0.6,3.3-3,5.5-7.1,5.5c-4.8,0-7.5-3.5-7.5-7.5c0-3.9,2.8-7.5,7.5-7.5c3.8,0,6.4,2.3,6.6,5h-3.5c-0.2-1.1-1.4-2.2-3.1-2.2c-2.7,0-4.1,2.3-4.1,4.7c0,2.5,1.4,4.7,4.4,4.7c2,0,3.2-1.2,3.4-2.7h-2.5V378.3z"></path><path class="sim-label" d="M461.4,380.9v-9.3h3.3v14.3h-3.5l-5.2-9.2v9.2h-3.3v-14.3h3.5L461.4,380.9z"></path><path class="sim-label" d="M472.7,371.6c4.8,0,7.5,3.5,7.5,7.2s-2.7,7.2-7.5,7.2h-5.3v-14.3H472.7z M470.8,374.4v8.6h1.8c2.7,0,4.2-2.1,4.2-4.3s-1.6-4.3-4.2-4.3H470.8z"></path></g></svg>
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