diff --git a/historico.py b/historico.py
index b64a7dd..15a5123 100644
--- a/historico.py
+++ b/historico.py
@@ -185,9 +185,12 @@ class Historico:
                 self.processo_pir = subprocess.Popen(['gpiomon', '-c', chip, '-b', 'pull-down', '-e', 'rising', linha],
                                                      stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
                 self.pir.update(disponivel=True, erro='')
+                inicio = time.monotonic()
                 for _ in self.processo_pir.stdout:
                     if not self.config['pir']:
                         break
+                    if time.monotonic() - inicio < 2:      # o pino "assenta" ao ligar o pull-down
+                        continue
                     self.pir['ultimo'] = time.time()
                     self.registrar('pir', 'presença')
                 erro = (self.processo_pir.stderr.read() or '').strip()[:200]