// you have joined the mesh
THE
PLAYGROUND
Experiments in radio, orbit & software from caldwell.tech
- click anywhere to transmit a packet
- hover a node for its telemetry
- ` opens the terminal — more secrets inside
01 TRANSMISSIONS
Things I build, break, and occasionally launch into the airwaves.
caldwell.tech
The mothership. Digital-age projects, write-ups, and whatever I'm currently obsessed with.
VISIT → RFMeshtastic Adventures
Off-grid LoRa mesh radios. Tiny solar nodes on hills, messages with no internet required. The animation behind this page is my love letter to it.
EXPLORE → ORBITSatellite Pointer
Point your phone at the sky and find satellites. The Mission Control panel below runs the same kind of math — live.
LAUNCH →02 MISSION CONTROL
Live position of the International Space Station, courtesy of wheretheiss.at. The shaded region is the actual night side of Earth, computed in your browser right now.
ISS (ZARYA) ACQUIRING…
- LAT
- —
- LON
- —
- ALT
- —
- VEL
- —
- SUN
- —
Uses your location (never leaves your browser) to compute where to point.
- AZ
- —
- EL
- —
- RANGE
- —
▲ ABOVE YOUR HORIZON — LOOK UP
03 THE MESH
Every dot drifting behind this page is a simulated LoRa node. Links form when nodes are in radio range; packets flood-route hop by hop, just like the real network. You're a node too — look for YOU.
04 FUEL THE LAB
This page costs me $0 to run (thanks, static hosting). The radios, antennas and solar panels do not. If something here made you grin:
No ads, no trackers, no cookies. Just signals.