feat: add SparkFun Humidity and Temperature Sensor Breakout - Si7021 (SEN-13763)

boards/SparkFun-Humidity-Temperature-Sensor-Breakout-Si7021/README.md

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+# SparkFun Humidity and Temperature Sensor Breakout - Si7021
+
+SparkFun Product: [SEN-13763](https://www.sparkfun.com/sparkfun-humidity-and-temperature-sensor-breakout-si7021.html)
+
+## Description
+
+The Si7021 is a low-cost, easy-to-use, highly accurate digital humidity and temperature sensor communicating over I2C. This breakout board includes built-in 4.7kΩ pullup resistors for I2C and a 100nF decoupling capacitor.
+
+## Features
+
+- Si7021-A20 humidity and temperature sensor
+- I2C interface (address: 0x40)
+- 3.3V supply voltage
+- Built-in 4.7kΩ I2C pullup resistors
+- Board size: 0.6" × 0.6" (15.24mm × 15.24mm)
+
+## Pinout
+
+| Pin | Signal | Description |
+|-----|--------|-------------|
+| 1   | VCC    | 3.3V power supply |
+| 2   | GND    | Ground |
+| 3   | SDA    | I2C data |
+| 4   | SCL    | I2C clock |
+
+## Resources
+
+- [Schematic PDF](https://cdn.sparkfun.com/datasheets/Sensors/Weather/SparkFun_Si7021_Breakout.pdf)
+- [Hookup Guide](https://learn.sparkfun.com/tutorials/si7021-humidity-and-temperature-sensor-hookup-guide)
+- [Si7021 Datasheet](https://cdn.sparkfun.com/assets/b/1/b/8/5/Si7021-A20.pdf)
+- [GitHub Design Files](https://github.com/sparkfun/Si7021_Breakout)

boards/SparkFun-Humidity-Temperature-Sensor-Breakout-Si7021/SparkFun-Humidity-Temperature-Sensor-Breakout-Si7021.circuit.tsx

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+import { sel } from "tscircuit"
+import { Si7021 } from "./imports/Si7021"
+
+/**
+ * SparkFun Humidity and Temperature Sensor Breakout - Si7021 (SEN-13763)
+ * Si7021-A20 I2C sensor with 4.7kΩ I2C pullup resistors
+ * Board size: 0.6" x 0.6" (15.24mm x 15.24mm)
+ *
+ * Schematic: https://cdn.sparkfun.com/datasheets/Sensors/Weather/SparkFun_Si7021_Breakout.pdf
+ */
+export default () => (
+  <board width="15.24mm" height="15.24mm" routingDisabled>
+    {/* Si7021 humidity and temperature sensor */}
+    <Si7021
+      name="U1"
+      pcbX={0}
+      pcbY={0}
+      connections={{
+        pin1: sel.net.SDA,
+        pin2: sel.net.GND,
+        pin3: sel.net.GND,
+        pin4: "net.NC",
+        pin5: sel.net.VCC,
+        pin6: sel.net.SCL,
+      }}
+    />
+
+    {/* 4.7kΩ I2C pullup resistors (built into board) */}
+    <resistor
+      name="R1"
+      resistance="4.7k"
+      footprint="0402"
+      pcbX={-4}
+      pcbY={2}
+      schX={-5}
+      schY={2}
+      connections={{ pin1: sel.net.VCC, pin2: sel.net.SDA }}
+    />
+    <resistor
+      name="R2"
+      resistance="4.7k"
+      footprint="0402"
+      pcbX={4}
+      pcbY={2}
+      schX={-5}
+      schY={0}
+      connections={{ pin1: sel.net.VCC, pin2: sel.net.SCL }}
+    />
+
+    {/* 100nF decoupling capacitor */}
+    <capacitor
+      name="C1"
+      capacitance="100nF"
+      footprint="0402"
+      pcbX={0}
+      pcbY={-4}
+      schX={-5}
+      schY={-2}
+      connections={{ pin1: sel.net.VCC, pin2: sel.net.GND }}
+    />
+
+    {/* Header pins: VCC, GND, SDA, SCL */}
+    <chip
+      name="J1"
+      footprint="pinrow4_p2.54mm"
+      pcbX={0}
+      pcbY={6}
+      schX={5}
+      schY={0}
+      pinLabels={{
+        pin1: ["VCC"],
+        pin2: ["GND"],
+        pin3: ["SDA"],
+        pin4: ["SCL"],
+      }}
+      connections={{
+        pin1: sel.net.VCC,
+        pin2: sel.net.GND,
+        pin3: sel.net.SDA,
+        pin4: sel.net.SCL,
+      }}
+    />
+  </board>
+)

boards/SparkFun-Humidity-Temperature-Sensor-Breakout-Si7021/imports/Si7021.tsx

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+import type { ChipProps } from "@tscircuit/props"
+
+/**
+ * Si7021-A20 - I2C Humidity and Temperature Sensor
+ * DFN-6 package (3mm x 3mm)
+ * Used on SparkFun Humidity and Temperature Sensor Breakout (SEN-13763)
+ */
+const pinLabels = {
+  pin1: ["SDA"],
+  pin2: ["GND"],
+  pin3: ["GND2"],
+  pin4: ["NC"],
+  pin5: ["VDD"],
+  pin6: ["SCL"],
+} as const
+
+export const Si7021 = (props: ChipProps<typeof pinLabels>) => {
+  return (
+    <chip
+      {...props}
+      pinLabels={pinLabels}
+      manufacturerPartNumber="SI7021-A20-IMR1"
+      supplierPartNumbers={{
+        jlcpcb: ["C94258"],
+      }}
+      footprint="dfn6_w3mm_h3mm_pl0.65mm_pw0.4mm"
+      schPinArrangement={{
+        leftSide: {
+          direction: "top-to-bottom",
+          pins: ["pin6", "pin5", "pin4"],
+        },
+        rightSide: {
+          direction: "top-to-bottom",
+          pins: ["pin1", "pin2", "pin3"],
+        },
+      }}
+    />
+  )
+}

boards/SparkFun-Humidity-Temperature-Sensor-Breakout-Si7021/index.tsx

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+import SparkFunHumidityTemperatureSensorBreakoutSi7021 from "./SparkFun-Humidity-Temperature-Sensor-Breakout-Si7021.circuit"
+
+export default SparkFunHumidityTemperatureSensorBreakoutSi7021