From 64f2626b4f451d7d4f3ab52fe5b77f2770255a23 Mon Sep 17 00:00:00 2001
From: pstruebi <struebin.patrick@gmail.com>
Date: Wed, 3 Sep 2025 11:57:25 +0200
Subject: [PATCH] add case temperature readout

---
 README.md                     | 11 +++++++++++
 poetry.lock                   | 18 +++++++++++++++++-
 pyproject.toml                |  3 ++-
 src/auracast/multicast.py     |  2 +-
 src/scripts/read_case_temp.py |  8 ++++++++
 5 files changed, 39 insertions(+), 3 deletions(-)
 create mode 100644 src/scripts/read_case_temp.py

diff --git a/README.md b/README.md
index 015f2b6..238bdb5 100644
--- a/README.md
+++ b/README.md
@@ -189,6 +189,17 @@ sudo ldconfig                        # refresh linker cache
 - disable pw login
 - reboot
 
+# Use temperature sensor
+- uncomment in config.txt: 
+	- dtparam=i2c_arm=on
+	- reboot
+- load drivers
+	- sudo modprobe i2c_bcm2835
+	- sudo modprobe i2c-dev
+	- echo i2c_bcm2835 | sudo tee -a /etc/modules
+	- echo i2c-dev     | sudo tee -a /etc/modules
+- read temp /src/scripts/temp
+
 # Known issues:
 - When running on a laptop there might be issues switching between usb and browser audio input since they use the same audio device
 
diff --git a/poetry.lock b/poetry.lock
index 895195e..ef35d0e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2453,6 +2453,22 @@ files = [
     {file = "six-1.17.0.tar.gz", hash = "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"},
 ]
 
+[[package]]
+name = "smbus2"
+version = "0.5.0"
+description = "smbus2 is a drop-in replacement for smbus-cffi/smbus-python in pure Python"
+optional = false
+python-versions = "*"
+groups = ["main"]
+files = [
+    {file = "smbus2-0.5.0-py2.py3-none-any.whl", hash = "sha256:1a15c3b9fa69357beb038cc0b5d37939702f8bfde1ddc89ca9f17d8461dbe949"},
+    {file = "smbus2-0.5.0.tar.gz", hash = "sha256:4a5946fd82277870c2878befdb1a29bb28d15cda14ea4d8d2d54cf3d4bdcb035"},
+]
+
+[package.extras]
+docs = ["sphinx (>=1.5.3)"]
+qa = ["flake8"]
+
 [[package]]
 name = "smmap"
 version = "5.0.2"
@@ -2934,4 +2950,4 @@ test = ["pytest", "pytest-asyncio"]
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.11"
-content-hash = "723981c612b424756f0338604c35c9cef37fd44ffd208e15c7865b1f5e83bc05"
+content-hash = "9fe0e4746a6fca45e5aa9117ca177a5587c3a7b83cacb9427bdb960c4f0c7036"
diff --git a/pyproject.toml b/pyproject.toml
index 3587878..77c2ed9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,8 @@ dependencies = [
     "streamlit (>=1.45.1,<2.0.0)",
     "aiortc (>=1.13.0,<2.0.0)",
     "sounddevice (>=0.5.2,<0.6.0)",
-    "python-dotenv (>=1.1.1,<2.0.0)"
+    "python-dotenv (>=1.1.1,<2.0.0)",
+    "smbus2 (>=0.5.0,<0.6.0)"
 ]
 
 [project.optional-dependencies]
diff --git a/src/auracast/multicast.py b/src/auracast/multicast.py
index f5d694b..abcc4f3 100644
--- a/src/auracast/multicast.py
+++ b/src/auracast/multicast.py
@@ -669,7 +669,7 @@ if __name__ == "__main__":
     #config.transport='serial:/dev/serial/by-id/usb-ZEPHYR_Zephyr_HCI_UART_sample_95A087EADB030B24-if00,115200,rtscts' #nrf52dongle hci_uart usb cdc
     #config.transport='usb:2fe3:000b' #nrf52dongle hci_usb # TODO: iso packet over usb not supported
     #config.transport= 'auto'
-    config.transport='serial:/dev/ttyAMA4,1000000,rtscts' # transport for raspberry pi
+    config.transport='serial:/dev/ttyAMA3,1000000,rtscts' # transport for raspberry pi
 
     # TODO: encrypted streams are not working
 
diff --git a/src/scripts/read_case_temp.py b/src/scripts/read_case_temp.py
new file mode 100644
index 0000000..2c6f619
--- /dev/null
+++ b/src/scripts/read_case_temp.py
@@ -0,0 +1,8 @@
+from smbus2 import SMBus
+addr = 0x48  # change if your scan shows different
+with SMBus(1) as bus:
+    msb, lsb = bus.read_i2c_block_data(addr, 0x00, 2)
+raw = ((msb << 8) | lsb) >> 4
+if raw & 0x800:  # sign bit for 12-bit
+    raw -= 1 << 12
+print(f"{raw * 0.0625:.2f} °C")